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１ 材料与方法 用含胎牛血清的ＤＭＥＭ（Ｇｉｂｃｏ，ＵＳＡ）培养ＰＣ１２细胞，制成浓度为２×１０６细胞悬液，按照ＣｈａｎｇＰＬ提出的方法［Ｂｉｏｔｅｃｈ＆Ｂｉｏｅｎｇｉｎ，１９９４，４３（２）：９２５］制作微囊，每个微囊含ＰＣ１２细胞４×１０４个。同样制
1 Materials and Methods PC12 cells were cultured in DMEM (Gibco, USA) containing fetal bovine serum to prepare a suspension having a concentration of 2 × 10 6 cells according to the method of ChangPL [Biotech & Bioengin, 1994, 43 (2): 925] Each microcapsule contains 4 × 104 PC12 cells. The same system