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Objective To observe the expression and kinetic alteration of adenosine deaminase (ADA) and guanase (GUA) during the carcinogensis of rat livers. 目的 观察腺苷脱氨酶（adenosine deaminase，ADA） 和鸟嘌呤酶（guanase， GUA） 在肝细胞癌变过程中的表达与动态变化。