Potent endogenous agonist peptide for the newly
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adrenal medulla. EC50 values are 13 and 16 nM for human SNSR3 and
SNSR4 respectively. Also potent opioid agonist (IC50 = 1.3 nM in
guinea-pig ileum preparation). Produces opioid- and non-opioid receptor
mediated antinociceptive effects in vivo.
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