PDB Statistics: Growth in Number of Unique Protein Sequences in Released PDB Structures (Cumulative) at Identity 50%

This chart shows the annual and cumulative numbers of protein sequences in released PDB structures. The chart can be viewed for a few different levels of sequence identity since the beginning of the PDB archive. The cumulative bars represent the growth in unique protein sequences (number of polymeric entities) across history. The yearly bars (dark blue) tell how many new protein sequences were added in a certain year.

Note: The total number of sequence clusters in the statistics table is linked to the sequence cluster group search result page. There is a default precision threshold in calculating the numbers for performance balance. So the statistics count may have a slight discrepancy compared to the actual non-redundant group search result when the result count approaches or goes above 10,000. The group search result page provides an accurate count. The statistics page provides the trend.

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Sequence cluster level:

YearNumber of New Protein SequencesTotal Number of Protein Sequences
19761212
19771123
1978326
1979228
1980331
1981738
19821856
1983763
19841174
1985983
1986891
19879100
198821121
198936157
199036193
199140233
199253286
1993166452
1994343795
19952841,079
19963151,394
19974711,865
19985692,434
19997443,178
20008544,032
20018784,910
20029295,839
200313417,180
200418729,052
2005210211,154
2006234113,495
2007255216,047
2008237618,423
2009243420,857
2010243223,289
2011218425,473
2012233227,805
2013245130,256
2014282933,085
2015250435,589
2016274038,329
2017286241,191
2018286144,052
2019308947,141
2020368750,828
2021301253,840
2022384657,686
2023376261,448
2024371565,163
2025255867,721