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
19795
19808
198110
198221
198316
198414
198518
198615
198716
198831
198943
199064
199176
199289
1993258
1994493
1995426
1996528
1997730
1998928
19991,185
20001,322
20011,489
20021,615
20032,085
20042,712
20052,971
20063,333
20073,646
20083,632
20093,651
20103,716
20113,604
20123,833
20134,019
20144,573
20154,332
20164,854
20175,053
20185,242
20195,449
20206,273
20215,784
20226,510
20236,793
20246,962
20256,131