求大虾帮把这句英语修改一下，自己写的，总觉得不对，但又不知道怎么改。
To date, only several research groups reported the phenomenon that the development of cloned embryos was affected by by individual genetic characteristics of nuclear-donor cell lines, more same reports are need to make this view convincible.
我想表达的意思是：
到目前为止，只有为数不多的几个研究小组报道了克隆胚胎发育受核供体细胞系个体的遗传背景的影响，更多相似的报道被需要使得这个观点更可信。
To date, only few groups reported that the development of cloned embryos was affected by individual genetic characteristics of nuclear-donor cell lines; yet more are needed to make this more convinciable.
To date, it has been reported by only few groups that the development of cloned embryos was affected by individual genetic characteristics of nuclear-donor cell lines. More researches are needed to confirm these studies.
To date, only several groups reported that the development of cloned embryos was affected by individual genetic characteristics of the nuclear-donor cell lines. Yet, more researches are necessary to convict this opinion.
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