cysP; sulfate transport system substrate-binding protein
cysU; sulfate transport system permease protein
cysW; sulfate transport system permease protein
cysA; sulfate transport system ATP-binding protein
Assimilatory sulfate reduction, sulfate => H2S)
sulfate adenylyltransferase
adenylylsulfate kinase
phosphoadenosine phosphosulfate reductase
sulfite reductase (NADPH)
sulfite reductase (ferredoxin)