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
198954
199074
199183
199297
1993288
1994579
1995509
1996588
1997843
19981,071
19991,401
20001,530
20011,667
20021,826
20032,484
20043,138
20053,468
20063,899
20074,333
20084,246
20094,408
20104,500
20114,371
20124,646
20134,972
20145,857
20155,481
20166,043
20176,571
20186,597
20197,177
20208,168
20217,668
20229,012
20239,557
20245,123