PIR-International Protein Sequence Database
PIR is, in part, a redundant
database. Sequences are made public as soon as the database curators receive
them, even before annotation or classification is verified. Redundancy has
it's disadvantages, most notably the repetition of sequences in different
entries may include discrepencies. The redundancy at PIR can be advantages, as
sequences are made public very quickly. The database is updated weekly.
The PIR-International protein
sequence database is partitioned into four sections: PIR1-PIR4. There is no
clear cut difference between the entries in PIR1 and PIR2.