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
1997807
19981,009
19991,345
20001,474
20011,606
20021,757
20032,373
20043,033
20053,347
20063,800
20074,181
20084,090
20094,238
20104,336
20114,199
20124,414
20134,691
20145,379
20155,077
20165,612
20175,993
20186,121
20196,586
20207,513
20216,939
20228,116
20238,544
20242,753