All genomes
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[Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] [ALL]
Genome names in green represent completed genomes
| Genome Name | No of Superfamily |
| Yaba-like disease virus | 20 |
| Yaba monkey tumor virus | 9 |
| Yamagishiella unicocca | 4 |
| Yarrowia lipolytica | 77 |
| Yellow fever virus | 8 |
| Yellow head virus | 1 |
| Yellowtail ascites virus | 1 |
| Yersinia enterocolitica | 76 |
| Yersinia intermedia | 2 |
| Yersinia pestis | 682 |
| Yersinia pseudotuberculosis | 33 |
| Yersinia ruckeri | 7 |
| Yoldia eightsi | 1 |
| Youngia japonica | 1 |
| Yponomeuta cagnagellus | 1 |
| Yponomeuta malinellus | 1 |
| Yucaipa virus | 1 |