PDB Statistics: Number of Unique Protein Sequences within Released PDB Structures (Annual) at Identity 50%

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
197612
197714
19783
19794
19808
198110
198222
198315
198413
198518
198615
198717
198833
198951
199070
199179
199293
1993266
1994540
1995486
1996560
1997808
19981,011
19991,346
20001,477
20011,606
20021,759
20032,376
20043,036
20053,348
20063,803
20074,183
20084,090
20094,238
20104,335
20114,203
20124,416
20134,692
20145,383
20155,076
20165,612
20175,994
20186,119
20196,586
20207,516
20216,938
20228,115
20238,540
20242,052