Heterogeneity of endogeneous opiates: H-endorphin is not correlated with enkephalin or with beta-endorphin.
D000818:Animals; D001923:Brain Chemistry; D004723:Endorphins / Q000097:blood / Q000502:physiology*; D004743:Enkephalin, Leucine; D004745:Enkephalins / Q000502:physiology*; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects; D051381:Rats; D001615:beta-Endorphin
D004723:Endorphins; D004745:Enkephalins; D004743:Enkephalin, Leucine; D001615:beta-Endorphin; C028986:endorphin, humoral