方法取健康活杀小猪断层皮片，经特殊处理去除表皮和真皮中的细胞成分，制成脱细胞异种真皮基质。

Methods Xenogenic acellular dermal matrix was made from fresh pig skin which had removed the cells and the cell debris by some extraordinary methods.

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术后30天活杀小鼠进行肝功能、肝组织he染色和VG染色、肝组织y染色体和白蛋白双重原位杂交等检查。

The examinations of hepatic function, hepatic tissue stained by he and VG, double in situ hybridization of albumin and Y-chromosome were performed at the 30th day postoperatively.

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我们本以为这是再简单不过的进化选择了：当药物杀向全体细菌时，总有那么几个幸运儿，基因突变了，小命保住了，它们可以活下来继续繁殖下一代，而剩下的那些倒霉蛋就从此命归黄泉了。

The accepted scenario was a simple case of evolutionary selection. In a bacterial population exposed to a killer drug, a few lucky individuals might have a genetic mutation that kept them alive.

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