Peptide sequence: GLKYINVGDL AREEQLYDGY DEEYDCPILD EDRVVDELDN QMREGGVIVD Sequence homology: Cow: 93%; Guinea Pig: 79%; Horse: 86%; Human: 100%; Mouse: 86%; Pig: 93%; Rabbit: 79%; Rat: 90%. Initiation of transcription by RNA polymerase II requires the act