ser5

KB-0742 dihydrochloride 是一种有效的、选择性的、口服的 CDK9 抑制剂，具有抗肿瘤活性，对CDK9 cyclin T1的IC50为 6 nM。它对CDK9 cyclin T1具有选择性，其选择性是其他 CDK 激酶的 50 倍以上。

Kemptide (Phospho-Ser5) is a phosphoreceptor peptide that serves as a specific substrate for cAMP-dependent protein kinase (PKA).

[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).

[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).