The following primary antibodies were used in this study: α-mouse RNA polymerase II CTD repeat (Abcam, ab817), α-mouse RNA polymerase II CTD repeat phosphor S5 (Abcam, ab5408), α-rabbit RNA polymerase II CTD repeat phospho S2 (Abcam, ab5095), α-rat RNA polymerase II CTD repeat phosphor S2 (Active Motif, Cat#61083), α-rabbit HSF (gift from John Lis), α-rabbit Polyhomeotic (Paro lab stock), α-rabbit Pleiohomeotic (gift from Judith Kassis), α-rabbit Pleiohomeotic (gift from Jurg Muller), α-mouse FLAG (Sigma, F1804), α-rat HA (Roche, 11 867 423 001).
The following secondary antibodies were used in this study: α-mouse IgG HRP-linked whole antibody (GE Healthcare, NA931), α-rabbit IgG HRP-linked whole antibody (GE Healthcare, NA934V), α-rat IgG HRP-linked whole antibody (GE Healthcare, NA935V), Goat α-mouse IgG Alexa Fluor 488 (Thermo Fisher Scientific, A-11001), Goat α-rabbit IgG Alexa Fluor 568 (Thermo Fisher Scientific, A-11011).