A structural constituent of postsynaptic actin cytoskeleton and structural constituent of postsynaptic intermediate filament cytoskeleton. Acts upstream of or within cellular response to leukemia inhibitory factor and neurofilament cytoskeleton organization. Located in Schaffer collateral - CA1 synapse and neurofilament. Is active in postsynapse. Is expressed in several structures, including gut; nervous system; neural ectoderm; and sensory organ. Orthologous to human INA (internexin neuronal intermediate filament protein alpha). [provided by Alliance of Genome Resources, Apr 2022]