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. Can be phosphorylated by DYRK2 (in vitro). Dephosphorylated by calcineurin in a Ca(2+) dependent manner (By similarity).