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
197715
19783
19797
19808
198111
198223
198319
198415
198518
198615
198717
198850
198958
1990101
1991134
1992111
1993453
1994863
1995676
1996768
19971,080
19981,503
19991,839
20001,962
20012,134
20022,298
20033,109
20043,952
20054,191
20064,850
20075,541
20085,335
20095,620
20105,841
20115,791
20126,260
20136,886
20148,119
20157,633
20168,509
20179,156
20189,313
201910,305
202011,810
202111,415
202213,274
202313,839
20248,366