[pser-2, pser5, pser7]-ctd

[pSer2, pSer5, pSer7]-CTD is a substrate for CDK7(cyclin-dependent protein kinase), a phosphorylated polypeptide at ser2, ser5, and ser7 of RNA polymerase II carboxyl terminus (CTD).

[pSer2, pSer5, pSer7]-CTD (TFA) is a phosphorylated polypeptide at ser2, ser5, and ser7 of RNA polymerase II carboxyl terminus (CTD) and a substrate for CDK7 (cyclin-dependent protein kinase).