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
1993226
1994440
1995404
1996484
1997661
1998838
19991,095
20001,241
20011,339
20021,476
20031,915
20042,475
20052,618
20062,977
20073,280
20083,298
20093,355
20103,447
20113,321
20123,459
20133,609
20144,115
20153,976
20164,350
20174,598
20184,731
20195,054
20205,757
20215,377
20226,078
20233,459