title: Detection of substance P-like immunoreactivity in nerve fibers in the heart of guinea-pigs but not rats.
mesh_terms: D000818:Animals; D006321:Heart / Q000294:innervation*; D007124:Immunoenzyme Techniques; D008297:Male; D009412:Nerve Fibers / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D013045:Species Specificity; D013373:Substance P / Q000378:metabolism*
chemical_list: D013373:Substance P