SYNTHESIS AND RADIORECEPTOR BINDING ACTIVITY OF TURKEY β-ENDORPHIN AND DEACETYLATED SALMON ENDORPHIN

Abstract
Des-acetylated salmon endorphin and turkey .beta.-endorphin were synthesized by the solid-phase method. Relative opiate activities in a radioreceptor binding assay [rat brain] are: human .beta.-endorphin, 100; des-acetylated salmon endorphin, 169; turkey .beta.-endorphin, 94. Thus, non-mammalian endorphins can show high activity in a mammalian assay system.

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