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
198314
198413
198516
198615
198717
198833
198949
199067
199178
199289
1993253
1994525
1995470
1996545
1997784
1998996
19991304
20001446
20011589
20021738
20032352
20042994
20053303
20063770
20074099
20084042
20094173
20104283
20114178
20124365
20134629
20145341
20155033
20165546
20175924
20186061
20196509
20207407
20216834
20225184