PDB Statistics: Number of Unique Protein Sequences within Released PDB Structures (Annual) at Identity 50%

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
197612
197714
19783
19794
19808
198110
198222
198315
198413
198518
198615
198717
198833
198951
199069
199179
199293
1993266
1994539
1995484
1996560
1997806
19981,008
19991,343
20001,473
20011,605
20021,756
20032,373
20043,035
20053,347
20063,802
20074,179
20084,087
20094,236
20104,333
20114,198
20124,415
20134,691
20145,380
20155,078
20165,613
20175,999
20186,122
20196,587
20207,511
20216,941
20228,122
20238,543
20244,547