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
197713
19783
19795
19807
198110
198222
198316
198413
198518
198615
198715
198834
198951
199073
199183
199295
1993287
1994558
1995481
1996574
1997813
19981,052
19991,348
20001,488
20011,646
20021,788
20032,405
20043,045
20053,332
20063,743
20074,171
20084,121
20094,228
20104,304
20114,160
20124,490
20134,732
20145,634
20155,198
20165,775
20176,194
20186,277
20196,681
20207,727
20217,154
20228,352
20238,837
20249,117
20257,703