在ABO血型系统中，孟买型个体的产生是由于缺乏

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24540' and id < 2107949 and id<>'2107949' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24540' and id > 2107949 and id<>'2107949' order by id asc limit 5