Deltorphin is a heptapeptide with a very potent opiate-like activity. Has high affinity and selectivity for delta-type opioid receptors. The two dermorphin-like peptides have a similar affinity and selectivity for the mu opioid receptor as dermorphin. Expressed by the skin glands. Belongs to the frog skin active peptide (FSAP) family. Dermorphin subfamily.