MOEP19 is a family of mammalian KH-like RNA-binding motifs. The family is expressed during early embryogenesis. It appears to effect an early form of molecular asymmetry within the murine oocyte cytoplasm. The family marks a defined cortical cytoplasmic domain in oocytes and provides evidence for mammalian oocyte polarity and a form of pre-patterning that persists in zygotes and early embryos through the morula stage [1].

1: Distribution of RNA binding protein MOEP19 in the oocyte cortex and early embryo indicates pre-patterning related to blastomere polarity and trophectoderm specification. Herr JC, Chertihin O, Digilio L, Jha KN, Vemuganti S, Flickinger CJ; Dev Biol. 2008;314:300-316. PMID:18191828