根据肿瘤发生的三阶段学说，肿瘤促进剂在肿瘤发生中也起到一定的关键性作用。
Three-stage hypothesis of carcinogenesis pointed out that tumor promoter might play a key role in tumor development.
微囊藻毒素（MC）是一类七肽单环肝毒素，MC-LR是一种强烈的肝脏肿瘤促进剂。
Microcystins (MC) are hepatotoxins containing cyclic heptapeptides. Microcystin-LR (MC-LR) is a strongly liver tumour promotor.
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