RNA-binding protein implicated in the regulation of several post-transcriptional events. May be involved in mRNA translation activation and stability (By similarity). Involved in the regulation of muscle-specific splicing of alpha actinin pre-mRNAs via the binding to the UR-repeat element (URE) at the branch point of the non-muscle (NM) exon. Expressed in the vegetal cortex of the oocyte. Expressed uniformly in the embryo. Expressed in the vegetal pole at 0.08 hour post-fertilization (hpf). Expressed in the lens fiber cells at 24 hpf and in the blastodisc of the zygote at 30 hpf. Belongs to the CELF/BRUNOL family.