第二种机制是一个渐进的适应性变异过程，在这一过程中，伴随人类受到感染，病毒与人体细胞相结合的能力增加了。
The second mechanism is a more gradual process of adaptive mutation, whereby the capability of the virus to bind to human cells increases during subsequent infections of humans.
体细胞变异结合物理化学诱变法可被视作改良果树作物的一种手段，并且在一些果树作物中获得了成功。
Thus, the somatic cell variation in combination with physical and chemical mutagenesis can be considered as one approach to improve fruit crops and have achieved success in some fruit crops.
结合RAPD、SSR、AFLP分析研究椪柑体细胞加倍发生的变异情况，RAPD、SSR分析没有检测到变异的发生，说明加倍过程很少发生重组。
RAPD, SSR and AFLP techniques were ultilized to analyze variations during somatic doubling. No diversities were found by RAPD and SSR analyses, indicating infrequent recombination.
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