| IPR022691 | Transcription elongation factor, GreA/GreB, N-terminal | Domain |
| IPR023459 | Transcription elongation factor GreA/GreB family | Family |
| IPR036805 | Transcription elongation factor, GreA/GreB, N-terminal domain superfamily | Homologous Superfamily |
| IPR036953 | Transcription elongation factor GreA/GreB, C-terminal domain superfamily | Homologous Superfamily |
| IPR018151 | Transcription elongation factor, GreA/GreB, conserved site | Conserved Site |
| IPR006359 | Transcription elongation factor GreA | Family |
| IPR001437 | Transcription elongation factor, GreA/GreB, C-terminal | Domain |
| IPR028624 | Transcription elongation factor GreA/GreB | Family |
| IPR007642 | RNA polymerase Rpb2, domain 2 | Domain |
| IPR015712 | DNA-directed RNA polymerase, subunit 2 | Family |
| IPR037033 | DNA-directed RNA polymerase, subunit 2, hybrid-binding domain superfamily | Homologous Superfamily |
| IPR037034 | RNA polymerase Rpb2, domain 2 superfamily | Homologous Superfamily |
| IPR007120 | DNA-directed RNA polymerase, subunit 2, hybrid-binding domain | Domain |
| IPR007121 | RNA polymerase, beta subunit, conserved site | Conserved Site |
| IPR007645 | RNA polymerase Rpb2, domain 3 | Domain |
| IPR014724 | RNA polymerase Rpb2, OB-fold | Homologous Superfamily |
| IPR019462 | DNA-directed RNA polymerase, beta subunit, external 1 domain | Domain |
| IPR010243 | DNA-directed RNA polymerase beta subunit, bacterial-type | Family |
| IPR007644 | RNA polymerase, beta subunit, protrusion | Domain |
| IPR007641 | RNA polymerase Rpb2, domain 7 | Domain |