Receptor, Endothelin AReceptors, EndothelinReceptor, Endothelin BEndothelinsEndothelin-1Peptides, CyclicSulfonamidesEndothelin-3Endothelin-2Viper VenomsPhenylpropionatesVasoconstrictionPyrrolidinesAspartic Acid EndopeptidasesAzepinesIndansOligopeptidesVasoconstrictor AgentsPiperidinesMetalloendopeptidasesBlood PressureRats, Sprague-DawleyAntihypertensive AgentsEndothelium, Vascular