Definition: Endogenously-synthesized compounds that may influence biological phenomena or represent quantifiable biomarkers. Biological factors are a variety of extracellular substances that are not otherwise classified under ENZYMES; HORMONES or HORMONE ANTAGONISTS
differentiate from BIOLOGICAL PRODUCTS; DF: BIOL FACTORS
endothelium-dependent hyperpolarization factor [ EDHF,endothelium-derived hyperpolarization factor ] may be related to anandamide; released from endothelium of rat pulmonary arteries; nonprostanoid, nonidentified factor that contributes to endothelium-dependent relaxation by causing hyperpolarization