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
198110101111
198221232323
198314161919
198413141415
198516181818
198614151515
198717171717
198828343550
198946535858
1990637375103
1991758387137
1992859499125
1993243279327480
1994472573660896
1995435505554701
1996505585634778
19977148449091129
1998897107412061557
19991183140015451898
20001336154816782049
20011447167318042191
20021603183719762328
20032122248926643141
20042710315633663986
20052884348837044243
20063307394641904932
20073636435446825561
20083637426845885385
20093728442347745616
20103825450848835832
20113729440147865796
20123906465851156285
20134069495655426869
20144707593567438139
20154514552263367658
20164944605869248491
20175283658576809126
20185440662776589305
201958237182843110236
202066068171973411691
202161967568934011358
20224659581572098522