PDB Statistics: Number of Unique Protein Sequences within Released PDB Structures (Annual) at Identity 90%

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.

Chart is currently loading

Sequence cluster level:

YearNumber of Unique Protein Sequences
197613
197715
19783
19797
19808
198110
198223
198318
198414
198518
198615
198717
198835
198956
199075
199187
199298
1993322
1994646
1995545
1996632
1997898
19981,169
19991,514
20001,642
20011,773
20021,936
20032,617
20043,322
20053,643
20064,090
20074,623
20084,493
20094,681
20104,760
20114,675
20124,976
20135,390
20146,517
20156,104
20166,640
20177,380
20187,370
20198,100
20209,369
20219,078
202210,611
202311,157
20246,033