label: CDK7 phosphorylates serine-5 and serine-7 of heptad repeats in C-terminal domain of RNA polymerase II at snRNA promoter (Homo sapiens)
label_lc: cdk7 phosphorylates serine-5 and serine-7 of heptad repeats in c-terminal domain of rna polymerase ii at snrna promoter (homo sapiens)