Synthetic multivulva class B (synMuvB) protein (PubMed:11463372, PubMed:17075059). SynMuvB proteins are required to repress the induction of vulval development by Ras signaling and probably act by forming the multiprotein DRM complex that represses transcription (PubMed:11463372, PubMed:17075059). May also negatively regulate vulval development in association with other SynMuv class B proteins such as lin-15A (PubMed:11463372). Can stimulate E2F-dependent transcription (PubMed:17075059). Plays a role in negatively regulating the progression through the G1 phase of the cell cycle during postembryonic development, most likely by acting as a transcriptional repressor in association with the cell cycle regulatory factor efl-1 and the transcriptional repressor lin-35, but may also act as a positive regulator of cell cycle entry (PubMed:12062054). Involved in the regulation of intestinal cell division during postembryonic development, most likely in complex with efl-1 and lin-35 (PubMed:17466069). Promotes germ cell programmed cell death, probably together with efl-1, by positively regulating the expression of the apoptosis proteins ced-3 and ced-4 (PubMed:17881492, PubMed:24752899). In particular, positively regulates the expression of ced-4 in response to starvation (PubMed:24752899). Its role in programmed cell death may be in conjunction with cell cycle regulatory factor efl-1 and the synthetic multivulva class B proteins lin-35, lin-37 and lin-52, and is independent of the ced-1, ced-8 and ced-9 pathways (PubMed:17237514). Component of the DRM complex, at least composed of lin-9, lin-35, lin-37, lin-52, lin-53, lin-54- dpl-1 and efl-1 (PubMed:17075059). Interacts (via N-terminus) with efl-1 (PubMed:11463372). Interacts (via C-terminus) with lin-35 (via C-terminus) (PubMed:11463372). Expressed throughout development. Highly expressed in somatic nuclei, as well as in immature germ cell and oocyte nuclei. Uncoordinated movements, also known as an Unc phenotype, most likely due to defective cell cycle progression defects in the Pn.a neuroblast lineage (PubMed:11463372). No obvious vulval development defects (PubMed:11463372). Programmed cell death defect in a ced-3 n2427 mutant background (PubMed:17237514). Double knockout with the n433 mutant of the synthetic multivulva class A protein lin-15A results in a multiple vulva (Muv) phenotype (PubMed:11463372). RNAi-mediated knockdown results in reduced postembryonic intestinal cell divisions (PubMed:12062054). Belongs to the E2F/DP family.