PDB Statistics: Number of Unique Protein Sequences within Released PDB Structures (Annual) at Identity 30%, 70%, 95%, 100%

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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Year30% Sequence Identity70% Sequence Identity95% Sequence Identity100% Sequence Identity
197611131313
197714131314
19783333
19795577
19808777
198110101111
198221222323
198316161919
198414131415
198518181818
198615151515
198716151515
198831343550
198943515656
1990647377103
1991768388132
1992909598109
1993259289328440
1994493557659844
1995427480544666
1996529573642770
19977308149001,067
19989281,0531,1931,472
19991,1851,3491,5001,799
20001,3221,4881,6321,930
20011,4901,6461,7942,086
20021,6151,7901,9542,256
20032,0852,4062,5883,017
20042,7113,0463,2913,845
20052,9723,3353,5944,099
20063,3353,7444,0504,722
20073,6484,1704,5515,359
20083,6324,1204,4805,198
20093,6554,2284,6155,393
20103,7144,3044,7405,618
20113,6104,1594,5725,528
20123,8334,4945,0155,998
20134,0144,7315,3696,597
20144,5755,6386,5187,837
20154,3345,2036,0937,277
20164,8525,7756,7578,205
20175,0466,1937,4058,744
20185,2436,2767,4378,929
20195,4466,6888,0349,737
20206,2737,7269,42611,228
20215,7887,1539,02810,830
20226,5128,35510,58612,512
20236,7928,83611,13913,090
20246,9589,11811,60013,625
20255,7647,3249,23010,729