下列哪种物质的合成过程仅在肝脏进行（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27518' and id < 2271288 and id<>'2271288' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27518' and id > 2271288 and id<>'2271288' order by id asc limit 5