DNA- and RNA-binding protein, involved in transcription repression and pre-mRNA splicing. The third RNA recognition motif, called PUMP domain, is atypical and may rather mediate homodimerization and/or protein-protein interactions. Morpholino-mediated knockdown of the gene results in embryos with reduced body length, microcephaly, retrognathia and heart edema. Belongs to the RRM half pint family.