The GenInfo Identifier is a sequence identification number for a nucleotide sequence. If a nucleotide sequence changes in any way, a new GI number will be assigned. A separate GI number is also assigned to each protein translation within a nucleotide sequence record, and a new GI is assigned if the protein translation changes in any way. GI sequence identifiers run parallel to the new accession.version system of sequence identifiers (see the description of Version).