Enkephalins in the heart.
D000818:Animals; D004558:Electric Stimulation; D004723:Endorphins / Q000032:analysis; D004745:Enkephalins / Q000032:analysis* / Q000494:pharmacology; D006168:Guinea Pigs; D006321:Heart / Q000294:innervation; D006892:Hydroxydopamines / Q000494:pharmacology; D009200:Myocardial Contraction / Q000187:drug effects; D009206:Myocardium / Q000032:analysis*; D016627:Oxidopamine; D011498:Protein Precursors / Q000032:analysis; D011863:Radioimmunoassay; D013564:Sympathetic Nervous System / Q000502:physiology
D004723:Endorphins; D004745:Enkephalins; D006892:Hydroxydopamines; D011498:Protein Precursors; C025681:alpha-neoendorphin; D016627:Oxidopamine