PDB Statistics: Number of Unique Protein Sequences within Released PDB Structures (Annual) at Identity 70%

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
19795
19808
198110
198223
198316
198414
198518
198615
198717
198834
198953
199073
199183
199294
1993279
1994573
1995505
1996585
1997844
19981074
19991400
20001548
20011673
20021837
20032489
20043156
20053488
20063946
20074354
20084268
20094423
20104508
20114401
20124658
20134956
20145935
20155522
20166058
20176585
20186627
20197182
20208171
20217568
20225815