DDBJ introduced a new system to identify for both nucleotide and protein sequences with version numbers (Nucleotide ID and Protein ID) since DDBJ rel. 37 (Mar. 1999).Therefore DDBJ released "get-version" system which is able to search these version numbers.To use this system, send an e-mail message containing the formatted query ACCESSION and VERSION NUMBER to the following e-mail address "get-version@nig.ac.jp".If you need help message, please send e-mail to get-version@nig.ac.jp with the word "help-e" in the mail body.