Methods Primary human corneal fibroblasts of passages 4 were used in this research.
方法原代培养角膜基质细胞，选取第4代细胞进行实验。
These cell colonies could be cultured at least up to 4 passages.
细胞克隆均至少能培养4代以上；
After a series of passages, the hereditary properties of the 4 fusion strains were found to be stable. Micechallenged.
连续传代证明4个融合株的双亲遗传特性是稳定的。
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