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
198957
199075
199186
199299
1993324
1994664
1995556
1996636
1997910
19981,208
19991,544
20001,675
20011,801
20021,977
20032,664
20043,365
20053,701
20064,183
20074,685
20084,590
20094,774
20104,881
20114,778
20125,101
20135,535
20146,748
20156,323
20166,922
20177,682
20187,658
20198,425
20209,712
20219,330
202211,018
20233,434