Expression of PAF complex and self-renewal proteins in retinoic acid-treated F9 embryonic carcinoma (EC) cells. (A): Expression of Paf1/PD2, Cdc73, Leo1, sKi8, and Ctr9, and self-renewal proteins Oct3/4, SOX2, and Nanog in differentiated F9 EC cells by Western blot analysis. (B): Western blot analysis showed the expression of Paf1/PD2, Cdc73, Leo1, sKi8, and Ctr9 and self-renewal proteins Oct3/4, SOX2, and Nanog in undifferentiated F9 EC cells. Abbreviations: Cont, control; RA, retinoic acid.