Enables signaling receptor binding activity and toxic substance binding activity. Involved in several processes, including cellular response to estradiol stimulus; intermediate filament cytoskeleton organization; and nervous system development. Located in axon; neurofilament; and perikaryon. Used to study amyotrophic lateral sclerosis and congenital hypothyroidism. Biomarker of hypothyroidism; sciatic neuropathy; and transient cerebral ischemia. Human ortholog(s) of this gene implicated in Alzheimer's disease and human immunodeficiency virus infectious disease. Orthologous to human NEFM (neurofilament medium chain). [provided by Alliance of Genome Resources, Apr 2022]