RNA-binding protein that binds to the 3'-UTR region of mRNAs and increases their stability. Involved in embryonic stem cells (ESCs) differentiation: preferentially binds mRNAs that are not methylated by N6-methyladenosine (m6A), stabilizing them, promoting ESCs differentiation (By similarity). Binds to poly-U elements and AU-rich elements (AREs) in the 3'-UTR of target mRNAs. Acts cooperatively with cribp to stabilize AU-rich sequence (ARE)-containing mRNAs. May play a role during gastrulation. Required for the vegetal localization of vg1 mRNA. Interacts (via RRM3) with cirbp. Unable to form oligomers (By similarity). Part of a ribonucleoprotein (RNP) complex, at least composed of elavl1/elrA and/or elavl2/elrB, igf2bp3/vg1RBP, ddx6/Xp54, ybx2/frgy2, lsm14b/rap55b and, in a subset of RNP complexes, stau1/staufen. Enriched at the vegetal cortex in stage III and IV oocytes. Shows very weak nuclear localization. Belongs to the RRM elav family.