P-body cytoplasmic foci P body GO:0000932 cytoplasmic mRNA processing body A focus in the cytoplasm where mRNAs may become inactivated by decapping or some other mechanism. Protein and RNA localized to these foci are involved in mRNA degradation, nonsense-mediated mRNA decay (NMD), translational repression, and RNA-mediated gene silencing. cellular_component Wikipedia:P_body cytoplasmic ribonucleoprotein granule