TABLE 1.

Opioid peptides: Two endorphin examples and some peptides resulting from enzymatic in vitro digestion of gluten and soybean (Fukudome & Yoshikawa, 1992; Fukudome & Yoshikawa, 1993; Kaneko et al., 2010)

Endorphin	Amino acid sequence of receptor message domain
Endomorphin‐1	Tyr‐Pro‐Trp‐Phe
Endomorphin‐2	Tyr‐Pro‐Phe‐Phe
Gluten Exorphin (GE) Peptide
GE‐A4	Gly‐Tyr‐Tyr‐Pro
GE‐B4	Tyr‐Gly‐Gly‐Trp
GE‐A5	Gly‐Tyr‐Tyr‐Pro‐Thr
GE‐B5	Tyr‐Gly‐Gly‐Trp‐Leu
GE‐C	Tyr‐Pro‐Ile‐Ser‐Leu
Soybean morphin‐5	Tyr‐Pro‐Phe‐Val‐Val