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What is FASTA format?

FASTA format is a text-based format for representing either nucleotide sequences or peptide sequences, in which base pairs or amino acids are represented using single-letter codes. A sequence in FASTA format begins with a single-line description, followed by lines of sequence data. The description line is distinguished from the sequence data by a greater-than (">") symbol in the first column. It is recommended that all lines of text be shorter than 80 characters in length.

An example sequence in FASTA format is:

Sequences are expected to be represented in the standard IUB/IUPAC amino acid and nucleic acid codes, with these exceptions:

The nucleic acid codes are:

        A --> adenosine           M --> A C (amino)
        C --> cytidine            S --> G C (strong)
        G --> guanine             W --> A T (weak)
        T --> thymidine           B --> G T C
        U --> uridine             D --> G A T
        R --> G A (purine)        H --> A C T
        Y --> T C (pyrimidine)    V --> G C A
        K --> G T (keto)          N --> A G C T (any)
                                  -  gap of indeterminate length
The accepted amino acid codes are:

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