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
1993231
1994439
1995403
1996482
1997659
1998830
19991,091
20001,235
20011,338
20021,473
20031,913
20042,473
20052,612
20062,963
20073,276
20083,295
20093,362
20103,439
20113,305
20123,457
20133,609
20144,102
20153,959
20164,339
20174,590
20184,725
20195,044
20205,742
20215,364
20226,049
20236,317
20246,333
20253,397