序列操作套件 SMS2：
DNA 统计
统计 DNA 序列中各碱基的出现次数与百分比。
载入示例数据
填充示例序列，方便快速体验
Paste the raw sequence or one or more FASTA sequences into the text area below. Input limit is 500,000,000 characters.
>sample sequence gggggaaaaatttttcccccnnnnngggggaaaaatttttcccccnnnnn