Variants of FastA

• FastA - Compares a DNA query sequence to a DNA database, or a protein query to a protein database, detecting the sequence type automatically.
  Versions 2 and 3 are in common use, version 3 having a highly improved score normalization method. It significantly reduces the overlap between the score distributions.
• FASTX - Compares a DNA query to a protein database. It may introduce gaps only between codons.
• FASTY - Compares a DNA query to a protein database, optimizing gap location, even within codons.
• TFASTA - Compares a protein query to a DNA database.