Enables several functions, including GPI-linked ephrin receptor activity; nerve growth factor binding activity; and neurotrophin p75 receptor binding activity. Involved in several processes, including detection of stimulus involved in sensory perception of pain; nervous system development; and regulation of programmed cell death. Acts upstream of or within cellular response to growth factor stimulus and protein autophosphorylation. Located in several cellular components, including dendrite; endosome; and neuronal cell body. Part of protein-containing complex. Used to study glaucoma and myofascial pain syndrome. Biomarker of several diseases, including colitis; diabetic neuropathy; glaucoma; periodontitis; and retinal detachment. Human ortholog(s) of this gene implicated in Alzheimer's disease; hereditary sensory neuropathy; hereditary sensory neuropathy type 4; and schizophrenia. Orthologous to human NTRK1 (neurotrophic receptor tyrosine kinase 1). [provided by Alliance of Genome Resources, Apr 2022]