| No. | DFBP ID | AA sequence | Peptide/Function name | Organism/Source | Precursor protein | PubDate |
| 1 | DFBPOPIO0118 | YPFV | Opioid peptide, hβ-Casomorphin-4 [2] | Human milk protein | β-Casein | 2014 |
| 2 | DFBPOPIO0143 | YPFV | Opioid peptide, β-Casomorphin-4 | Soybean | β-Conglycinin β-Subunit | 2007 |
| 3 | DFBPOPIO0148 | YPFV | Opioid peptide, hβ-Casomorphin-4 | Human milk protein | β-Casein | 1980 |