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Table 2 Distribution of orphan enzyme activities in a few model organisms

From: ORENZA: a web resource for studying ORphan ENZyme activities

  EC numbers
Model organisms Total Orphans (/total) Species specific orphans (/total orphans)
Escherichia coli 1792 189 (0.11) 25 (0.13)
Arabidopsis thaliana 651 22 (0.03) 0 (0)
Saccharomyces cerevisiae 1254 129 (0.10) 14 (0.11)
Drosophila melanogaster 417 16 (0.04) 4 (0.25)
Homo sapiens 1560 225 (0.14) 6 (0.02)