使用说明：
1. MTT溶液的配制：用5ml MTT溶剂溶解25mg MTT，配制成5mg/ml的MTT溶液。配制后即可使用，或直接
   -20℃避光保存，也可以根据需要适当分装后-20℃避光保存。
2. 通常细胞增殖实验每孔加入100微升2000个细胞，细胞毒性实验每孔加入100微升5000个细胞(具体每孔所
   用的细胞的数目，需根据细胞的大小，细胞增殖速度的快慢等决定)。按照实验需要，进行培养并给予
   0-10微升特定的药物刺激。
3. 每孔加入10微升MTT溶液，在细胞培养箱内继续孵育4小时。
4. 每孔加入100微升Formanzan溶解液，在细胞培养箱内再继续孵育。直至在普通光学显微镜下观察发现
   formazan全部溶解。通常37℃孵育4小时左右，紫色结晶会全部溶解。如果紫色结晶较小较少，溶解的时
   间会短一些。如果紫色结晶较大较多，溶解的时间会长一些。
5. 在570nm测定吸光度。如无570nm滤光片，可以使用560-600nm的滤光片。

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