PDB Statistics: Number of Unique Protein Sequences within Released PDB Structures (Annual) at Identity 95%

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
198110
198223
198319
198414
198518
198615
198717
198835
198956
199075
199186
199299
1993323
1994660
1995555
1996634
1997909
19981,207
19991,546
20001,678
20011,803
20021,976
20032,662
20043,366
20053,705
20064,184
20074,688
20084,586
20094,776
20104,882
20114,779
20125,106
20135,537
20146,749
20156,336
20166,919
20177,685
20187,667
20198,445
20209,732
20219,352
20228,493