序列操作套件 SMS2：
DNA 取样
从引导序列中随机抽取碱基，生成指定长度的序列。
载入示例数据
填充示例序列，方便快速体验
Enter the length of the sequence you wish to construct. Maximum accepted value is 10,000,000.
Paste the raw or FASTA guide sequence into the text area below. Input limit is 10,000,000 characters.
>sample sequence aaaaaaaaaaatt
Number of sequences to generate:
1
10
50
100