# FASTA format description

  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:

      >gi|532319|pir|TVFV2E|TVFV2E envelope protein
      ELRLRYCAPAGFALLKCNDADYDGFKTNCSNVSVVHCTNLMNTTVTTGLLLNGSYSENRT
      QIWQKHRTSNDSALILLNKHYNLTVTCKRPGNKTVLPVTIMAGLVFHSQKYNLRLRQAWC
      HFPSNWKGAWKEVKEEIVNLPKERYRGTNDPKRIFFQRQWGDPETANLWFNCHGEFFYCK
      MDWFLNYLNNLTVDADHNECKNTSGTKSGNKRAPGPCVQRTYVACHIRSVIIWLETISKK
      TYAPPREGHLECTSTVTGMTVELNYIPKNRTNVTLSPQIESIWAAELDRYKLVEITPIGF
      APTEVRRYTGGHERQKRVPFVXXXXXXXXXXXXXXXXXXXXXXVQSQHLLAGILQQQKNL
      LAAVEAQQQMLKLTIWGVK

  Sequences are expected to be represented in the standard IUB/IUPAC amino acid and nucleic acid codes, with these exceptions: lower-case letters are accepted and are mapped into upper-case; a single hyphen or dash can be used to represent a gap of indeterminate length; and in amino acid sequences, U and * are acceptable letters (see below). Before submitting a request, any numerical digits in the query sequence should either be removed or replaced by appropriate letter codes (e.g., N for unknown nucleic acid residue or X for unknown amino acid residue).
  The nucleic acid codes supported 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

  For those programs that use amino acid query sequences (BLASTP and TBLASTN), the accepted amino acid codes are:

          A  alanine                         P  proline
          B  aspartate or asparagine         Q  glutamine
          C  cystine                         R  arginine
          D  aspartate                       S  serine
          E  glutamate                       T  threonine
          F  phenylalanine                   U  selenocysteine
          G  glycine                         V  valine
          H  histidine                       W  tryptophan
          I  isoleucine                      Y  tyrosine
          K  lysine                          Z  glutamate or glutamine
          L  leucine                         X  any
          M  methionine                      *  translation stop
          N  asparagine                      -  gap of indeterminate length