PDB Statistics: Number of Unique Protein Sequences within Released PDB Structures (Annual) at Identity 30%

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
197611
197714
19783
19794
19808
198110
198221
198314
198413
198516
198614
198717
198828
198947
199063
199175
199287
1993238
1994469
1995432
1996500
1997709
1998887
19991,175
20001,326
20011,425
20021,581
20032,086
20042,665
20052,858
20063,273
20073,593
20083,614
20093,667
20103,767
20113,672
20123,841
20134,022
20144,633
20154,438
20164,877
20175,182
20185,314
20195,689
20206,464
20216,036
20226,868
20232,133