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
1995433
1996502
1997710
1998891
19991,177
20001,327
20011,429
20021,580
20032,088
20042,664
20052,858
20063,271
20073,588
20083,611
20093,675
20103,770
20113,679
20123,847
20134,024
20144,642
20154,452
20164,881
20175,193
20185,323
20195,701
20206,485
20216,054
20226,878
2023816