SEARCH Articles Figures Tables 5-Receptor affinity binding properties Binding properties P-Receptor affinity binding properties Receptor binding Receptor binding properties of Tyr-D-Ala-Phe-Asp-Val-ValThr -Gly Receptor binding properties ofTyr-D-Ala-Phe- Tyr-Pro-Ser Receptor properties The Law of Mass Action, binding sites and receptors—understanding why specific, potent biological activity is a rare property for any one chemical to possess