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
198314
198413
198516
198614
198717
198828
198946
199063
199175
199285
1993243
1994472
1995435
1996505
1997714
1998897
19991183
20001336
20011447
20021603
20032122
20042710
20052884
20063307
20073636
20083637
20093728
20103825
20113729
20123906
20134069
20144707
20154514
20164944
20175283
20185440
20195823
20206606
20216196
20224659