1) Opioid peptide 
Exorphins are exogenous opioid peptides, distinguished from endorphins (or endogenous opioid peptides). Exorphins include opioid food peptides and microbial opioid peptides and any other opioid peptide foreign to a host that have metabolic efficacy for that host. ...
Type: Term Pronunciation: eks-ōr′fin Definitions: 1. Food-derived opioid peptide, found in wheat gluten.