例句與造句

1. Mhc is an extended cluster of genes with extraordinary polymorphism , which consists of three classes of genes ( class i , class ii and classiii ) . they are different from each other in their structure , expression , mode of evolution and so on . class ii genes are further divided into two subclasses and the mhc genes spread over nearly all vertebrates extensively
   Mhc基因是一個(gè)高度多態(tài)的基因群，主要包括三大類基因?類( class ) 、類( class )和類( class )基因，它們無論在結(jié)構(gòu)組成、表達(dá)組織的類型、刺激特定t細(xì)胞的類群及長(zhǎng)期進(jìn)化等方面都有所不同；類基因還可進(jìn)一步分為a 、 b兩個(gè)亞類：各類基因廣泛分布于各種脊椎動(dòng)物體內(nèi)。
2. It's difficult to find cluster of gene in a sentence. 用cluster of gene造句挺難的