A physiologically active amine,C5H9N3,found in plant and animal tissue. It is released from cells of the immune system in human beings as part of an allergic reaction.

• 组胺具生理活性的胺类，C5H9N3，发现于植物或动物组织内。作为过敏反应的一部分由人体免疫系统细胞释放。