Endorphins

**Definition:** One of the three major groups of endogenous opioid peptides. They are large peptides derived from the PRO-OPIOMELANOCORTIN precursor. The known members of this group are alpha-, beta-, and gamma-endorphin. The term endorphin is also sometimes used to refer to all opioid peptides, but the narrower sense is used here; OPIOID PEPTIDES is used for the broader group.

**Tree numbers:** - D12.644.400.575.241 - D12.776.631.650.575.241

**Synonyms:** - Endorphin