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
197613
197714
19783
19795
19807
198110
198222
198316
198413
198517
198615
198715
198831
198946
199066
199180
199288
1993269
1994517
1995455
1996546
1997761
1998976
19991,261
20001,399
20011,563
20021,693
20032,279
20042,890
20053,162
20063,557
20073,949
20083,898
20093,972
20104,045
20113,906
20124,190
20134,396
20145,100
20154,736
20165,290
20175,571
20185,727
20196,034
20206,980
20216,399
20227,389
20237,717
20247,892
20256,437