RNA-binding protein that may be involved in the regulation of pre-mRNA alternative splicing. Expressed in the nervous system. Not expressed maternally. Expressed throughout the neural plate at stage 13. Expressed in trigeminal ganglia at stage 20. Expressed in the spinal cord, hindbrain and ventral floor of the fore- and midbrain at early tailbud stages. Expressed throughout the CNS, including eyes, epiphyse, nasal pits, cranial ganglia and nerves at stage 38. Belongs to the CELF/BRUNOL family.