看清楚，这里所说的是Fastq格式，不是Fasta格式，要了解Fasta格式，请看Fasta格式的详细说明。Fastq格式也是序列格式中常见的一种。下面简单介绍一下FASTQ格式，

A FASTQ file normally uses four lines per sequence. Line 1 begins with a '@' character and is followed by a sequence identifier and an optional description (like a FASTA title line). Line 2 is the raw sequence letters. Line 3 begins with a '+' character and is optionally followed by the same sequence identifier (and any description) again. Line 4 encodes the quality values for the sequence in Line 2, and must contain the same number of symbols as letters in the sequence. Continue Reading