在研究突变机制时，发现有6例由于核苷酸的替换引起了限制性位点的增减。
In the study of mutation mechanism, it was found in 6 cases that there were gains and losses of sites due to nucleotide substitution.
他还指出，对于任何一种基因突变的化验分析都应作为补充试验，以此来反映不同机制所产生的变异。
He concluded that the assays for mutations in either gene should be considered complementary tests, reflecting mutations that occur through different mechanisms.
显然这个基因的突变，或更可能是激活这个基因的控制机制的突变产生了团藻。
Apparently, a mutation in this gene-or, more probably, in the control system that activates it-gave rise to Volvox.
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