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Table 2 Distribution of five serine protease families across various prokaryotic taxonomic groups represented in 91 genomes.

From: Genome-wide survey of prokaryotic serine proteases: Analysis of distribution and domain architectures of five serine protease families in prokaryotes

Lineage Trypsin Subtilisin Beta-lactamase Clp protease Lon protease
Euryarchaeota (11) 2 22 3 2 18
Crenarchaeota (5) 5 15 2 3 -
Alphaproteobacteria (6) 32 10 43 10 6
Betaproteobacteria (10) 24 24 13 11 12
Gammaproteobacteria (13) 37 38 48 25 31
Firmicutes (18) 42 49 75 31 24
Actinobacteria (8) 51 33 46 19 9
Chlorobi (3) 8 8 7 4 2
Cyanobacteria (3) 13 6 10 9 -
Deltaproteobacteria (2) 26 18 4 2 8
Others (12) 7 4 3 15 7
Total 247 227 254 121 117