Immunogen sequence: FRDWLDCSSM EIKPNVVAME ILAYLAYETV AQLVDLALLV RQDMVTKAGD PFSHAISATF IQYHNSAEST AACGVEAHSD AIQPCHIREA IRRYSHRIGP LSPFT. The transcription of many RNA polymerase II-dependent genes requires Spt3, a member of the S. cerevisiae SAGA complex