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RPO21 | RNA polymerase II largest subunit B220; part of central core; phosphorylation of C-terminal heptapeptide repeat domain regulates association with transcription and splicing factors; similar to bacterial beta-prime. (1733 aa) | ||||
RPB3 | RNA polymerase II third largest subunit B44; part of central core; similar to prokaryotic alpha subunit. (318 aa) |