Methods Epithelial cells were isolated from sample tissue by cold trypsinization and cultured in serum-free growth medium.

方法 标本组织块用冷消化法出尿路上皮细胞，培养于血清生长培养基。

Methods Separate the embryonic fibroblast of mice and culture with the method of suspension culture and method of trypsinization.

方法取胎成纤维细胞,别采用细胞悬液法和胰酶消化植块培养法对其进行培养。