Receptor, Endothelin BReceptors, EndothelinReceptor, Endothelin AEndothelin-1EndothelinsEndothelin-3Viper VenomsEndothelin-2Peptides, CyclicPyrrolidinesHirschsprung DiseasePiperidinesLentigoOligopeptidesHepatopulmonary SyndromeSodium Chloride, DietaryEnteric Nervous SystemRNA, MessengerPhenylpropionatesBlood PressureRats, Sprague-DawleyRats, WistarMuscle, Smooth, VascularSulfonamidesPeptide FragmentsCells, CulturedGene ExpressionMolecular Sequence DataVasoconstrictionUp-RegulationDisease Models, AnimalAspartic Acid EndopeptidasesSignal Transduction