Complex sentence: Tyr-Gly-Gly-Phe-Leu and it produces pharmacological effects at both the mu and delta opioid receptors, showing selectivity for the delta receptor.
Split into simpler sentences: Tyr-Gly-Gly-Phe-Leu. It produces pharmacological effects at both the mu and delta opioid receptors, showing selectivity for the delta receptor.