Binds mRNA and regulates the stability of target mRNA. Homodimer. Interacts with STYX (By similarity). Detected at cytoplasmic stress granules and P-bodies. Detected at exosome granules where mRNA is degraded (By similarity). Widely expressed. Can be phosphorylated by DYRK2 (in vitro) (By similarity). Dephosphorylated by calcineurin in a Ca(2+) dependent manner, and probably by PP2A or PP4 serine phosphatases in cAMP- and PKC-mediated pathways.