Description of target: This gene encodes a preproprotein that is proteolytically processed to generate multiple protein products. These products include the pentapeptide opioids Met-enkephalin and Leu-enkephalin, which are stored in synaptic vesicles, then released into the synapse where they bind to mu- and delta-opioid receptors to modulate the perception of pain. Other non-opioid cleavage products may function in distinct biological activities.;Species reactivity: Human;Application: ;Assay info: Assay Methodology: Quantitative Sandwich ELISA;Sensitivity: 31 pg/mL