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X-gal      5-bromo-4-chloro-3-indolyl-β-D-galactoside  5—溴-4-氯—3吲哚-F-D-半乳糖苷

XGPRT      xanthine-guanine phosphoribosyl transferase  黄嘌呤-鸟嘌呤-磷酸核糖转移酶