抑素 Traditional form: 抑素 Pinyin (reading): yìsù Definitions: chalone (protein inhibiting cell proliferation) Characters: 抑 - to curb, to hinder; to keep down, to repress 素 - plain; white; vegetarian; formerly; normally Traditional characters: 抑 - to curb, to hinder; to keep down, to repress 素 - plain; white; vegetarian; formerly; normally