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.

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Sequence cluster level:

YearNumber of Unique Protein Sequences
197613
197713
19783
19797
19807
198110
198223
198319
198414
198518
198615
198715
198835
198954
199078
199187
199297
1993321
1994635
1995531
1996628
1997890
19981,164
19991,466
20001,599
20011,766
20021,916
20032,542
20043,234
20053,545
20063,963
20074,474
20084,401
20094,533
20104,639
20114,475
20124,884
20135,242
20146,350
20155,898
20166,542
20177,129
20187,183
20197,704
20209,022
20218,602
202210,077
202310,635
202411,034
20258,819