在小鼠中，这些基因的突变可导致小鼠额外足趾的生长，所以有理由认为熊猫第二拇指生长的原因也是基因突变。
In mice, mutations in these genes are known to encourage extra digits to grow, so it is not unreasonable to suspect that they are also the cause of this in pandas.
拇指是我们最强壮和最好的手指，它有额外的特别强健肌肉拉向手掌。
The thumb is our strongest and best-equipped finger, that has a special, husky extra muscle that pulls it toward the palm.
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