. "Buratowski, S"^^ . "Cho, EJ"^^ . "Komarnitsky, P"^^ . "PubMed"^^ . "11018013"^^ . "Genes Dev 14:2452-60"^^ . "Different phosphorylated forms of RNA polymerase II and associated mRNA processing factors during transcription."^^ . "2000"^^ .