这个词是什么意思？
A subclass of alpha-adrenergic receptors that mediate contraction of SMOOTH MUSCLE in a variety of tissues such as ARTERIOLES; VEINS; and the UTERUS. They are usually found on postsynaptic membranes and signal through GQ-G11 G-PROTEINS.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D018340 · MeSH 2026。
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