DNA sequence variation in the same species of animals was only observed in human, donkey and mouse, and the number is less than 4 (1.3%), other animals showed no intraspecies variation.
同种动物不同个体间只有人、驴及小白鼠存在变异，最多有4个碱基变异位点(1.3%)，其它动物未发现种内变异。
Initially, three core courses were developed: Sequence Similarity Search, Genetic Variation, and Human Genome Resources.
最初，三个核心课程被开发：序列相似性搜索、遗传变异和人类基因组资源。
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