本文比较了不同年龄的鼠肝ＤＮＡ甲基化酶活力及ＤＮＡ甲基化水平，发现它们均与鼠龄呈反相关。又以不同年龄的鼠肝ＤＮＡ为模板，检验了其体外转录活力，发......

A solid leukemia sarcoma has been successfully developed after subcutaneous inoculation of the cultured human promyelocy......