| KEGG ID | KO | Definition |
| ptr:100615467 | K11252 | LOW QUALITY PROTEIN: histone H2B type 2-E |
| ggo:101124769 | ||
| umr:103665194 | K11252 | histone H2B type 1-N-like |
| bta:525433 | K11252 | histone H2B type 1 |
| bta:526064 | K11252 | histone H2B type 1-L |
| bta:613752 | K11252 | histone H2B type 2-E |
| bta:617908 | ||
| bom:102268723 | K11252 | histone H2B type 2-E-like |
| bom:102270696 | K11252 | histone H2B type 2-E |
| bom:102277056 | K11252 | histone H2B type 1-H |
| bom:102278241 | K11252 | histone H2B type 1-N-like |
| bom:106701373 | K26106 | uncharacterized LOC106701373 |
| biu:109558408 | K11252 | histone H2B type 2-E-like |
| biu:109560141 | K11252 | histone H2B type 1-like |
| biu:109563452 | K11252 | histone H2B type 1-L-like |
| biu:109564388 | K11252 | histone H2B type 2-E-like |
| biu:109570414 | K11252 | histone H2B type 1-like |
| ssc:100155267 | histone H2B type 2-F-like | |
| ssc:100621915 | K11252 | histone H2B type 1-N |
| lve:103074679 | K11252 | histone H2B type 1-A-like |