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
198313
198413
198516
198614
198717
198827
198944
199061
199173
199283
1993228
1994435
1995401
1996483
1997659
1998832
19991,093
20001,237
20011,340
20021,475
20031,911
20042,468
20052,614
20062,970
20073,274
20083,290
20093,357
20103,441
20113,312
20123,459
20133,609
20144,106
20153,971
20164,349
20174,596
20184,729
20195,055
20205,752
20215,367
20226,070
20236,344
20241,402