Pleuronectes platessa (European plaice): 128457352
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Entry
128457352 CDS
T09923
Name
(RefSeq) protocadherin-16
KO
K16507
protocadherin-16/23
Organism
pplt
Pleuronectes platessa (European plaice)
Pathway
pplt04519
Cadherin signaling
Brite
KEGG Orthology (KO) [BR:
pplt00001
]
09130 Environmental Information Processing
09133 Signaling molecules and interaction
04519 Cadherin signaling
128457352
09180 Brite Hierarchies
09183 Protein families: signaling and cellular processes
04515 Cell adhesion molecules [BR:
pplt04515
]
128457352
Cell adhesion molecules [BR:
pplt04515
]
Cadherins
Cadherin related
128457352
SSDB
Ortholog
Paralog
GFIT
Motif
Pfam:
Cadherin
Cadherin_FAT4_N
Ig_Cad99C_N
Cadherin_CELSR2_9th
Ig_CLSTN
Cadherin_2
RET_CLD1
Fibulin_C
YxzE
TMEM154
CADH_Y-type_LIR
Cadherin_C_2
TED6
Motif
Other DBs
NCBI-GeneID:
128457352
NCBI-ProteinID:
XP_053297977
LinkDB
All DBs
Position
15:4922992..4991836
Genome browser
AA seq
3302 aa
AA seq
DB search
MPITSKGSRRWAWVSGSCVPLWRWKPLYLCIVIVVVQFTTAHGALELQLDEEQPAGTIVG
DISAGLPPGETASLYFISDNEGTGVGNDLNIDETTGIITTARRLDREQKDHYSFIAVTMT
GITIEVSVTVNDINDHVPVFPKEKAVLKIPEHTAVGTRFSLEPATDADKDQLTIQGYAIK
EGNVGQAFRLETKRATNKVLYLDLVVNGPLDREKRSSYSLVLEAFDGGSPKKMGSMSLEV
TVTDINDHAPLFNQSRYHAIISESLPQGSSILQVFATDEDESDNGLVLYEINRRQSDPDR
YFVMDVKSGVITLNRPLDYELKRVHELVVQARDNASHPEVTNAFVTIHVRDYNDNQPTMT
IIFLSEDGSPRISEGAQPGQYVARISVTDPDYGEYANVNVSLEGGDGKFALTTKDSIIYL
IYVDQVLDREERDSYDLRVMATDSGTPPLRAESSFTIQVTDVNDNPPLFDQQAYRQTIPE
VVYPGSFVLQVTARDKDQGPNGDIKYSLLKGKTSHSDWFSIDPVTGIITTAAALDFESEP
APSVTVIATDNGRPPLSSTAKVDIVLQDVNDNPPVFSSSIYNASIKENTPAGTCFLEVSA
TDEDRGSFGAISYRLGSGSAGGLVPTQFTLDKETGQLCTSTALDRDEGLDKFDLTVTATD
GGGLSSVARVQVSVVDINDNRPTFYPVLYTVSLSAHSAPGTSVVKVTANDPDAGDNGRVT
YRTVPGGGSTFFTLNKDTGVISLSRSLHGKANTVISIVISADDGGGLTAPVNARVNVSVV
GGSVASPTFEQAQYFFTVSEDVLRGTAVGVVRAAAKTAASKDIFYSISSGDPEGYFKVDS
ASGTIRTALPLDHETCSSLDLEIQARSGSPPAYGTSRVRITISDVNDNAPTFLPSSSESL
LLPEVTKMGTVIYRIQATDKDSGHNGQLSFDLVSAGAAGSTGQRTFGVDRGSGEVRLIGG
LSYDSVPRYDLQVVAKDGGAPQLSSTFTLVVHIQAQDAQGPNFDTLTYRVELRENTPLNT
RFLQVRALNREASGNGGSSSSSSSSISYRLRPDGDAAGFGIMPDSGWLFVRSSLDREVKD
MYLLTVLASLGPGGTGRTGSATVRVSVTDENDNSPRLSQERVFLAVRENLLAGTGFGRVS
ATDRDAGLNARLTYRLLHADRHFQINSQTGEISTRLALDREQQSSYQLVVVVQDGGTPPR
SATGTAHITVLDENDHAPSFIHARPDRELLLQVMEGLPSGTVLGTLTAKDSDEGENGTVY
YSLSGSRAERFSLNPTSGELRTSAPLRWAERAEYTFDVTAADHGTPGLSSTCQIRIQVLS
STRSNPKPNMLSMTLNIVEGVPPGSVVGSLRPHDKQDSILEGQVTYLVVGGTDRDGTFMV
DRLKGDVYLVRELDYEKGSKYMLQVEVSDFSQAFPSSHLVQLDINVQDSNDHAPKFTEDP
VTIVIPENMEPGASIYTFQAVDQDGSGPNSELRYSIEHYWPDTPDFLTVDPFTGVLTFGQ
QLDRESTPSLFLVVRATDQASDPSQRRWGSVTARVFVTDENDNAPVFSSPSAVSIMEDQP
VGFVILYVMARDDDEGENGRVSYRIQTGNSAGRFSLNPNTGSLSILKSLDREEQEDFNLT
IVAEDHGIPQLSRSQVLCVQVIDVNDEAPVFQRAEFETQVMENQGPGTTVLTVTATDRDQ
GSNGQVTYGGVTEEGFVINPVTGVITTTKELDAELQDHFTLTVYARDGGLPPNFAKAVVR
VEVQDVNDNAPVFSKPWYQVEVPENQAPVELCFLKATDPDSGPGGQLEYRITAGDPQGDF
QLHVSTGALSTSRGLDRETNAVYNLEVVATDRGSPALSTTATVEVKVMDVNDNSPLFDRN
TYSVEVSEDAAEGTHILEVTATDADDELNGKVLYFLSRETHGAFAVDENTGRITTAAPLD
REKLASYSFQVFAVDLSPAAPRNTSAQVTVTVLDVNDNTPFFIQDPLVIEVSSRNSQRVL
ATMKAEDKDFGANGSVFYRFAMPVKGFSINSLTGEIQATQPLGDLTQAQRTLIVEAMDQG
TPAQSAQGVVVIYVKEVQYSGIRFSRNARDVSIQENTANGTTVAQAQAQHPDGTRKGISY
SLFSGNKMHAFSISSSSGEIWVQKSRGLDFEDAPRLRLVVKAETISSTSFMAINLILQDI
NDNLPRFQLQNYVAFMREAQGYDMPIIQVVAEDVDQGQNGQVTYSIQSSGMSGLFKIDPM
TGSITTAAIMDREIFTQTKLVVTATDRGSPRLAGSATLTVIIIDQNDNSPTIPLPKEVRI
PENMLIGTEITLVTGNDVDSSPALSYTLQLDPTASGKFGIHRYSGGVSLTAPLDFEEKTW
YTVTVRATDSQHQAEANITILVEDVNDNAPVFTLDLYQVTLPEHTPPGSAVITVTATDRD
SGDNGKITYSVTSSTQEGFWVDPNNGTLFISHRAEFDPERPSVSVVIEARDGGSPSLSSL
TTVQVQISDVNDNAPVFHQSDYRATVAEDTIPGSTVLTFEAFDSDLSRENCGFDFAIAYG
NEGNAFQIESSVRFLEGRGFQTVGTLLLAEGLDFETKPLYNLTVVVSDRGVPQRSSSVAA
VITISDVNDNPPVFSSAEYTVSLSEGAAAGTEIIRLTATDPDSTPNAEVQYTISSGNEVN
LFSMDQWTGALRLQQALDREHQSTHVVIIQATDGQGHFTLAPVFVDVKDINDNHPFFPVE
VLTASIRENQPANSAVTVLHAIDHDTGVFGQLKYYMVERSRVGKDSFIVDQNSGEIRSRM
SFDFEKVNAFNFVAVAVDSGNHTATVTVQVFVTGEDEYDPTFTSSDFTFEVPEGAKKGQS
IGQVQANDEDGGVDGIVLYSLPTSSPYFDVNKTTGAIFLKLDSSGSSSSSSGSGRSKRDT
RLMTLDVRAHSPLDTSRTTTSQVSIDVTNTNFGLATDVNILLISIVAVSLGFIILLVVLA
VVVFLVKSRRKKKAQDTGNRTVASGTALQKLDECNSGSGGERIYHQALPGYAGDQGGGGG
GPYTRGGSLDPSHSSGRGSAEAAEDDEIRMINEYPRVASITSSMQEHISARGPDSGIQQD
ADQLSDISCEPAALEGSTWFKGKKLGGSLSGTLLSGQLPVYRDDGGGYLGVGRGLNISLP
KDYPFPEDGKPSVDGSLTAIVASDEELRGSYNWDYMLNWCPQFQPLANVFTEIARLKDET
AQQSQNPRQPFQPKPKMDPKPRIDPPPLITSVAHPGAMSVPPKVPVIGRTFPHLASLRRS
PISHEGSISSAAMSPSFSPSLSPLAARSPAVSPFGVNQGPSASMISTRDPSLDQSPDREM
RI
NT seq
9909 nt
NT seq
+upstream
nt +downstream
nt
atgccaataacaagtaaagggtcaagacggtgggcttgggtcagtggctcctgtgtgcct
ctctggaggtggaagccgctctatctctgcattgtcattgttgttgttcagtttacaacc
gcccatggagcgttggagctccagctggatgaagagcagcctgctgggaccatcgttggg
gatatcagtgccgggttaccacctggtgaaactgcaagtctttacttcatctcagacaat
gaaggcacaggtgttggcaatgatcttaacattgacgaaaccactggcatcatcaccacc
gctcgccgcctggaccgcgagcagaaggaccactacagcttcatcgctgtgacaatgaca
ggaatcacgatcgaggtgtcagtcactgtcaacgacatcaacgaccatgtgccagtgttc
cctaaagagaaagctgttctcaagattcctgagcacacagcagtggggacaaggttttcc
ctggaacctgcgactgatgcggacaaggaccagctgactatccaaggctatgcgattaaa
gagggcaatgtaggccaggcattcagactggagaccaagagagccactaacaaggtgctg
tatctggacctggtggtcaatgggccactggacagggagaaacgctcgtcctacagcctt
gtactggaggcgtttgatgggggctcgcccaaaaagatgggatccatgagtctggaagtg
acagtgacggacatcaatgatcatgcgcctttgttcaatcagagcagataccacgccatt
atctctgaaagtcttccacaaggaagtagcatcctacaggtgtttgcaacagacgaggat
gagagcgataatggtctggtgctttatgaaatcaaccggcgtcagagtgaccctgaccgc
tacttcgtcatggacgtaaagtcaggggtcatcaccctgaataggcccctggactatgag
ctgaagagggtccatgaactggtggtccaggccagggataacgccagccaccctgaagtg
accaacgcgtttgtgactatccatgtccgtgactacaacgacaaccagccaaccatgacc
atcatcttcctcagcgaggacggctctccgagaatctcagagggggcccaaccaggacag
tatgtggcccggatatctgtcaccgacccagactacggagagtacgccaacgtaaatgtg
tccctcgagggcggtgatgggaagtttgctcttacaaccaaggacagcataatttacctc
atatatgtggaccaagtcttggatagagaggaacgtgattcgtacgaccttcgggtgatg
gccacggactccggcacgcctcccctcagggccgagtcgtctttcaccatccaggtgacc
gacgtcaatgacaacccccctctctttgaccagcaggcctacagacaaactatccctgag
gttgtgtatcctggatcttttgttttgcaagttaccgctagggacaaggaccaaggacct
aatggggacatcaaatatagcctcctcaagggtaaaacctctcactctgattggttttca
attgacccggtcacagggataataaccaccgcagccgctctggatttcgaatcagagccg
gcacccagcgtgactgtgattgcgactgataacggccggccgcccctctcctccactgcg
aaggtggacatcgtgctgcaggatgttaacgataacccacctgtgttctccagcagcatc
tacaatgcctccataaaggagaacactccagctgggacctgcttcttagaggtgtcggcc
acagatgaggatcgcggttccttcggcgccatctcctaccggctgggctcgggctcggca
ggcggcctggtaccgacgcagttcaccctggacaaggagacgggccagttgtgcaccagc
acggctctggaccgtgacgaggggctggacaagtttgacttgactgtgactgcaacggat
ggaggaggtctgagctcagtggcccgtgtgcaggtttcagtggtggacatcaacgacaac
cggcccaccttctatccggtgctctacaccgtgagcctcagcgcccacagcgccccggga
acctctgtcgtaaaggtcacagccaatgaccccgacgctggggacaacggcagggtgacc
taccgcacagtgcctggagggggctccacattctttaccctcaacaaggacacaggggtc
atttctctctcccgctcgctccacggcaaagccaacacagttatctccattgtgatatcg
gccgatgacggcggtggcctgacggcgccggtcaacgctcgggtgaacgtgagcgtggtc
ggcggctcggtggcgtcgcccacgtttgagcaggcgcagtatttcttcaccgtgtccgag
gacgtcctcagggggacggcggtgggagttgtccgtgccgctgccaagacagctgcctct
aaggacattttctactccatctcttccggagaccctgagggctacttcaaggtggacagt
gcctctggtaccatccgtacagctcttcctttggaccatgagacctgctccagtctagac
ctggaaatccaggcacgctccggctctcctcccgcgtacggaaccagccgggtacggata
accatctctgatgtgaacgacaacgcccccaccttcctgccctcctcatccgagtccctc
ctcttaccagaggtcaccaaaatggggactgttatctaccgcattcaggccactgacaag
gattcaggtcataacggtcagctcagcttcgacctggtctctgccggagctgcaggcagc
actggccagaggacgtttggtgttgaccggggaagcggggaggtgcgtctgatcgggggt
ctgtcttacgacagtgtcccacgctatgaccttcaggtggttgccaaggatggcggagcg
cctcagcttagctccaccttcaccctcgtggtccacatccaagcacaagatgcacaaggc
cccaactttgacaccctgacctaccgtgtggagttacgggaaaacactccgctcaacacg
cgtttcctccaggtccgagcgctcaacagagaggcttctgggaatggtggaagctcctcc
tcctcatcttcctctatttcctaccgccttcggcctgacggggacgccgctggttttggc
atcatgcccgatagtggttggctctttgtccgtagctctctggaccgagaggtcaaggac
atgtacctgttgaccgtccttgcctctttaggcccaggagggacggggagaactggaagt
gccacagtcagggtgtcagtgactgacgagaacgacaactcccccagactgagccaggag
agggtgttcctggctgtgagagagaacctgctggccgggaccggctttggacgagtgtct
gctacagacagggatgcaggactaaatgctcgactcacctacaggctcctgcacgctgac
agacactttcagatcaactcacaaacaggtgagatcagcacccgcctcgccctggacaga
gagcagcagtccagttaccagctggttgtggtcgtccaggatggggggacgcccccccgc
agtgctaccggcaccgctcacatcactgtgctggatgaaaacgaccacgcccccagtttc
attcatgccaggccggacagggagctgctccttcaggtgatggagggtcttccatctggg
acagtcttagggaccctgacagctaaagactcagatgaaggcgagaatgggactgtgtac
tactctttatcaggctccagagccgagcgcttctccctcaacccgaccagtggcgagctg
aggaccagtgcccctctgagatgggcggagcgagccgagtacaccttcgatgtgacggct
gctgaccacggaacaccgggcctgagctccacctgccagatacggatacaggttctcagc
tccaccaggtccaacccgaagcccaacatgctctccatgaccctgaacatcgtggaaggc
gtccccccgggctcagtcgtcggctccctccgcccacacgacaagcaagactccatactg
gagggccaggtcacctacctcgtggtggggggcacagaccgcgacggcaccttcatggtg
gaccgtttgaagggcgacgtgtacctggtgcgcgagctggactacgagaaggggtcgaag
tacatgctgcaagtggaggtgtccgacttctctcaagcgtttcccagcagccacctggtg
cagctggatatcaacgtgcaggacagcaacgaccacgcgcccaagttcacggaggaccca
gttaccatcgtgatcccagagaacatggagccgggggcgtcgatttacaccttccaggcc
gtggatcaggacggcagtggacccaacagtgagctacgttactccattgagcactactgg
ccggacacacctgacttcctgaccgtcgaccccttcactggagtcctgacctttgggcag
cagctggaccgtgagtccacgccctccctcttcctcgtggtgcgggccacggaccaggca
tcggatccctctcagaggcgatggggctcggtcaccgctcgggtctttgtgacggacgaa
aacgacaacgccccggtcttcagctctccgtctgcagtcagcatcatggaggaccagcct
gtggggtttgtgattttgtacgtgatggctcgagatgacgatgagggagaaaatggccgc
gtgtcgtacaggatccagacggggaacagcgctgggcgcttcagtctgaacccaaacacc
ggctccctctccatcctgaaatccctggaccgggaagaacaggaggacttcaatctgacc
attgtggcggaggatcatgggataccgcagctctccaggtcccaggtgctgtgcgtgcag
gtgatcgacgtgaacgacgaggctcccgtgttccagcgagcagagttcgagacccaggtg
atggaaaaccaagggccgggaaccacggtgttgacagtgactgccaccgacagggatcaa
gggtccaatggccaagtgacatacggaggtgtgacggaggaaggcttcgtcatcaaccct
gtgacgggggtcatcaccaccacgaaggagctggacgcggagctacaggatcacttcact
ctcaccgtgtatgccagggacggagggctgcctcccaactttgccaaggccgtggtccgc
gtggaggtgcaggacgtgaacgacaacgccccggtgttctcgaagccgtggtaccaggtg
gaggtgccagagaaccaggccccggtggagctctgctttctcaaagctacagaccctgac
tcaggtcccggtggacagctggagtacaggatcactgcgggagaccctcaaggagatttc
caactccacgtcagcaccggagccctgtccacgtcccgaggcctagaccgggagacgaat
gcggtgtataatctcgaggtggtggccacggaccgaggcagcccggctctcagcacgacc
gccacggtggaggtcaaagtgatggatgtcaatgacaacagcccgctcttcgacaggaac
acctactctgtggaagtgtcagaggatgctgcagagggcacacacattctggaggtgacg
gccacagacgctgatgatgagctgaatgggaaggttctgtatttcctgagccgggagacg
cacggagcgtttgctgtggatgagaacaccggacgcatcaccacggctgcaccgctggac
cgggagaaactggcatcgtacagcttccaggtgtttgccgttgacctttcacctgctgca
cccaggaacacgtctgctcaggtgacagtcaccgtcctggacgtcaacgacaacaccccc
ttcttcatccaggacccacttgtcattgaagtgtccagtcgaaactctcagcgggttcta
gccacgatgaaggcagaggacaaggacttcggggccaacggttctgtgttctaccgtttc
gcgatgccggtgaagggtttcagtatcaactccctgactggggagatccaggccactcag
ccattgggagatctgactcaggctcagaggacgttgatcgtggaggccatggaccagggc
acccccgctcagtccgcacagggtgtggtggtgatctacgtgaaggaggtgcagtacagt
ggcattcgcttctcgaggaatgccagagacgtcagcatacaggagaacaccgcaaacggc
acaaccgtggctcaggctcaggctcaacacccggacggcacacggaagggtatcagctac
agcctcttcagtgggaacaagatgcatgcattcagcatcagctcctcatcaggtgaaatc
tgggtgcagaaatccagaggcctggactttgaggacgcccccagactccggctcgtcgtg
aaggctgaaactatatcctccacctctttcatggccatcaacctgatcctgcaggatatc
aacgacaaccttccgcgctttcaactgcagaactatgtagccttcatgagagaggcacag
ggatatgatatgccgatcatacaggtggtggccgaggatgtggaccagggccagaacggt
caggtgacctactccattcagtcatcgggtatgagcggcctgttcaagattgacccgatg
acaggaagcatcaccacagccgccatcatggaccgtgaaatctttacccagaccaaactc
gtggtcacagccaccgatagaggaagtccaagattggctggctctgccacgttgacagtg
atcatcattgatcagaacgacaacagtcccactattccattacctaaggaagtccggatc
ccagagaacatgttgatcggcacagagatcactctcgtgacgggcaatgacgtggactcc
agtcccgccctctcctacactttgcagctggatccaacggcgtccggcaagtttgggatc
caccgttacagcggaggcgtgtcactcaccgcccctctggactttgaggagaagacgtgg
tacaccgtcactgtccgggccacagacagccagcaccaggcggaggctaacatcacaata
ctggtggaggatgttaacgacaatgcacccgtgttcacccttgatctctaccaggtaact
ctgccggagcacacgccgccggggagtgcggtcatcacggtgacagccactgacagggac
tcaggcgacaacggaaagatcacctacagcgtgacgtcgtcaacccaggagggattctgg
gttgaccccaacaatggcaccctgttcattagtcacagagctgagtttgaccctgagcgt
ccgtcagtcagtgtcgtcattgaagctcgtgatggaggctcgccatcgctctcgtccctg
accaccgtccaggttcagatctctgacgtcaatgacaacgctcctgtgttccatcaatct
gattacagggctacagttgcagaggacaccattccagggtcgacagtcttgaccttcgag
gccttcgatagcgacctctcaagagaaaactgtggcttcgacttcgccatcgcctacggc
aatgagggaaacgccttccagattgaaagcagcgtgcgcttcctggaggggcggggcttt
caaactgttgggactctgctgttggccgaggggctcgacttcgaaaccaagccactgtac
aacctcacagtggtggtatcggaccgtggcgttccccagaggagctcgagtgtggctgca
gtgattaccatcagtgatgtgaatgataaccctccagtgttcagcagtgctgaatacacc
gtgtccctgagtgagggagctgctgccgggacggagatcattcgactcactgctacagac
ccagactcaactcccaatgctgaggtccagtacaccatcagctctggtaatgaggtgaac
ttattttccatggaccagtggactggagctctgcgtcttcagcaggcactggatcgtgag
caccagtccacacatgttgtcatcatccaggccacagacggacagggacacttcacgcta
gctccggtgtttgtcgacgtcaaagacatcaatgataatcatccattcttccctgtggaa
gtcctgacagcgagtatcagagaaaaccaaccagccaactcagcagtgactgttctccac
gctatcgaccatgacacaggggtcttcggccagttgaagtactacatggtggaacggtcc
agggtgggaaaagacagtttcattgtggatcaaaactcaggagaaatcagaagcagaatg
tcctttgactttgagaaggtcaacgccttcaactttgtagcagtcgctgtagattcaggg
aaccacacagccactgtgactgttcaggtgtttgtcacgggcgaggatgagtatgacccc
accttcacgtcttctgatttcacttttgaagtcccagagggagccaagaaaggccagagc
attggccaggtccaagcaaatgatgaggatggaggtgtggatggtattgttctttattct
ctccccaccagctctccatactttgacgtaaacaaaaccaccggggcaattttcctcaag
ctggacagttcaggcagtagcagtagcagcagtggctcgggccggtccaaaagggacacc
aggctgatgactctagacgtgagagctcacagtcctctggatacatctcggaccacgacc
tcccaggtctccatcgacgtcacaaacaccaactttggcctggctactgacgtgaacatt
ctactgattagcatcgttgctgtgtcccttggtttcatcatcttgcttgtggtcctggcc
gtggtggtgttcctggtcaagtcacgaaggaaaaagaaagcacaggatacaggaaacaga
actgtagcctcgggaactgctctgcagaaactggatgagtgcaactcgggttctggaggt
gagagaatctaccaccaggccctgccaggctatgctggagatcagggtggaggcggtggt
ggtccctacacccgagggggctctctcgatccctctcactcgagtggaagaggatcggct
gaagcggcggaagatgatgaaatcaggatgataaacgagtacccccgtgttgcctccatc
acctcgtccatgcaggagcacatctcggcccgaggaccagactctgggattcagcaggat
gctgaccagctctcggatatctcctgtgaacctgcagctttggagggtagcacttggttc
aaaggaaagaaactgggaggcagtctcagtgggacgttgctgtctggccagctcccagta
tacagggatgatggaggtgggtacctaggagtaggtcgtggcctcaacatctccttaccc
aaggattatcccttccctgaagacggtaaaccttcagtggatggttccctcacagccatc
gtagccagtgacgaggagctccgtggaagctataactgggattacatgcttaactggtgc
ccgcagttccagcctcttgctaatgtcttcacagagattgccaggctgaaagacgaaacc
gcccagcagagccagaacccccgccaaccattccagcccaagcccaaaatggatcccaaa
cctcgaattgatcctccacccctcatcacatcagtggcacacccaggggccatgtcagtc
ccacccaaggtccccgtgattggacggacattcccccatttggcctcactccgcaggtcc
cccatcagtcatgagggctccatctcatctgcagcaatgtcccccagcttctccccctct
ctgtcccctctggcggctcggtctccagctgtttctcccttcggagtcaaccaggggccc
tcagcgtccatgatcagcaccagagatccctcgctggaccagagtccagatcgggagatg
agaatatga
DBGET
integrated database retrieval system