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(A) Arterial contractile response to serotonin was significantly increased by hyperoxia (n = 8 vessels from 3 animals) compared with normoxia (n = 20 vessels from 6 animals). (B) Arterial contractile response to phenylephrine was significantly increased by hyperoxia (n = 11 vessels from 4 animals) compared with normoxia (n = 20 vessels from 6 animals). *** P < 0.001.
