PDB Statistics: Number of Unique Protein Sequences within Released PDB Structures (Annual) at Identity 95%

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
197715
19783
19797
19808
198111
198223
198319
198414
198518
198615
198717
198835
198958
199075
199186
199299
1993325
1994661
1995554
1996634
1997909
19981206
19991545
20001677
20011805
20021975
20032665
20043365
20053704
20064185
20074686
20084590
20094775
20104880
20114784
20125113
20135544
20146751
20156335
20166925
20177678
20187659
20198427
20209735
20219343
20226000