| Domain | Name | Category | Type |
| IPR002719 | Retinoblastoma-associated protein, B-box | Domain | Domain |
| IPR002720 | Retinoblastoma-associated protein, A-box | Domain | Domain |
| IPR013763 | Cyclin-like | Domain | Domain |
| IPR015030 | Retinoblastoma-associated protein, C-terminal | Domain | Domain |
| IPR024599 | Retinoblastoma-associated protein, N-terminal | Domain | Domain |
| IPR028308 | Retinoblastoma-like protein 2 | Family | Family |
| IPR028309 | Retinoblastoma protein family | Family | Family |
| IPR036915 | Cyclin-like superfamily | Family | Homologous superfamily |