蜂毒肽对去内皮主动脉环由苯肾上腺素引起的收缩无作用；
In endothelium-denuded aorta rings, melittin did not have the effect on the contractile responses induced by PHE.
目的：观察血小板衍生生长因子- BB (PDGF - BB)对大鼠主动脉血管环的收缩作用。
AIM: to investigate the effects of platelet-derived growth factor BB (PDGF-BB) on vasoconstriction of the vascular vessels.
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