May play a role in translational regulation of stored mRNAs in transcriptionally inactive haploid spermatids. Binds to poly(U) RNA oligomers (PubMed:12672660). Required for cell cycle progression, specifically for the transition from metaphase to anaphase (By similarity). Interacts with TENT2/GLD2. Expressed in embryo, cerebellum, salivary gland, thymus, heart, liver, lung, spleen, kidney, intestine, ovary and round spermatids. Weakly expressed in granular cells of dentate gyrus and the pyramidal cells of CA3 and CA1 of the hippocampus. Not induced by kainate. Belongs to the RRM CPEB family.