PBs are associated with mRNA decay and contain the decapping enzymes DCP1/2, the 5' to 3' exonuclease Xrn1, the Lsm proteins (1-7), and the scaffolding proteins hedls/GE-1 and GW182. Both SGs and PBs contain mRNA, eIF4E, microRNAs and argonaute proteins, and various regulators of mRNA stability and translation (TTP, RCK/p54, and CPEB).