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
19991,344
20001,474
20011,606
20021,756
20032,373
20043,033
20053,346
20063,800
20074,178
20084,090
20094,237
20104,334
20114,198
20124,412
20134,690
20145,378
20155,077
20165,609
20175,994
20186,121
20196,586
20207,511
20216,940
20228,114
20238,539
20243,192