威尔·马特说之所以有这么多的试验失败，是因为很难保证空卵囊和供体细胞能处在细胞分裂周期的同一阶段。
Wilmut said there were so many failures because it was difficult to ensure that the empty oocyst and the donor cell were at the same stage of the cell division cycle.
结果表明，2,4 - D是诱导体细胞胚胎发生的关键因素，当培养基中只含2,4 - D而不含或少含细胞分裂素(6 - BA)时，外植体经由体细胞胚胎发生途径形成再生植株。
The results showed the explants could regenerate via somatic embryogenesis when the medium contained only 2, 4-d without or with little content of 6-ba.
每条染色体细胞都含有两个拷贝(一个来自母方，一个来自父方)，当细胞分裂时，这些染色体就要复制，因此子代细胞仍有两个拷贝。
Cells have two copies of nearly every chromosome (one each from the mother and father) and they must duplicate these during cell division so that the subsequent cells will also have two each.
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