PDB Statistics: Number of Unique Protein Sequences within Released PDB Structures (Annual) at Identity 100%

This chart shows the total number of unique protein sequence clusters in PDB structures released within each year. Unique sequence clusters are defined using the sequence identity (SI). A value of 95% SI is used by default, since for practical purposes this identifies proteins with few differences, and thus can be considered to be the same sequence. The chart can also be redrawn with a more stringent 100% SI criterion, or with lower SI values that identify unique protein families (70% SI) or unique protein folds (30% SI).
The annual numbers of protein sequences may be displayed by specific levels of SI, either separately in different charts or simultaneously in the same chart.

Note: The number of unique sequences in the statistics table is linked to the sequence cluster 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 Unique Protein Sequences
197613
197714
19783
19797
19807
198111
198223
198319
198415
198518
198615
198715
198850
198956
1990103
1991132
1992109
1993440
1994844
1995666
1996770
19971,067
19981,472
19991,799
20001,930
20012,086
20022,256
20033,017
20043,845
20054,099
20064,722
20075,359
20085,198
20095,393
20105,618
20115,528
20125,998
20136,597
20147,837
20157,277
20168,205
20178,744
20188,929
20199,737
202011,228
202110,830
202212,512
202313,090
202413,625
202510,729