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
198313161919
198413141415
198516181818
198614151515
198717171717
198827343550
198943545658
1990617475101
1991738389134
19928397100111
1993228288331453
1994437577679862
1995402509562676
1996482586647768
19976588449161,080
19988291,0721,1991,504
19991,0901,4011,5481,842
20001,2341,5301,6801,962
20011,3371,6651,8052,132
20021,4721,8251,9812,297
20031,9102,4822,6753,108
20042,4723,1353,3913,953
20052,6133,4723,6974,193
20062,9613,8974,1874,855
20073,2754,3324,7155,542
20083,2944,2524,5855,335
20093,3604,4054,7945,618
20103,4424,5024,8705,842
20113,3034,3744,7805,790
20123,4554,6465,1296,261
20133,6104,9755,5736,888
20144,1055,8646,7448,123
20153,9585,4866,3187,643
20164,3416,0346,9238,502
20174,5906,5667,6969,167
20184,7246,5997,6829,315
20195,0557,1838,48510,320
20205,7448,1699,81611,818
20215,3637,6739,51111,424
20226,0579,01011,15413,269
20236,3259,55711,71713,847
20246,3419,63711,97814,220
20251,6402,3102,6533,015