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
197714151515
19783333
19794577
19808888
198110101011
198221232323
198314161919
198413141415
198516171818
198614151515
198717171717
198828343550
198947535758
1990637375103
1991758286137
1992879499125
1993238277324480
1994469569664896
1995432507556700
1996500584636776
19977098429101,128
19988871,0671,2081,555
19991,1751,3971,5441,897
20001,3261,5461,6752,048
20011,4251,6721,8012,190
20021,5811,8421,9772,331
20032,0862,4852,6643,140
20042,6643,1543,3653,984
20052,8573,4933,7014,245
20063,2733,9464,1834,929
20073,5934,3564,6855,555
20083,6134,2644,5925,383
20093,6684,4264,7745,612
20103,7674,5114,8825,831
20113,6724,4034,7775,787
20123,8414,6555,1036,274
20134,0224,9415,5356,866
20144,6345,9236,7488,134
20154,4375,4996,3247,633
20164,8756,0356,9228,478
20175,1836,5397,6829,114
20185,3136,5997,6619,298
20195,6887,1378,42310,213
20206,4648,1289,71311,675
20216,0367,5149,32811,342
20226,8698,78811,01913,183
20232,0202,4382,8283,228