[No need of angiotensin II to activate AT-1 receptors].
D000804:Angiotensin II / Q000502:physiology*; D000818:Animals; D006801:Humans; D044140:Receptor, Angiotensin, Type 1 / Q000502:physiology*
D044140:Receptor, Angiotensin, Type 1; D000804:Angiotensin II