Enables long noncoding RNA binding activity. Acts upstream of or within mRNA splice site selection. Located in cytoplasm and nucleus. Is expressed in several structures, including foregut; hemolymphoid system gland; limb; nervous system; and urinary system. Human ortholog(s) of this gene implicated in developmental and epileptic encephalopathy. Orthologous to human CELF2 (CUGBP Elav-like family member 2). [provided by Alliance of Genome Resources, Apr 2022]