古细菌的细胞壁缺乏胞壁质，其连接是醚连接而不是酯连接。
Archaean cell walls lack murein, and their lipids have ether links rather than ester links.
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对胞壁质酶R2基因进行了限制酶切图谱分析。
The restriction map of R2 gene was construed for further use.
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