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Table 1 Browsing the EC hierachy. For each level are indicated the total number of EC numbers and that of orphan EC numbers between brackets.

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

Class 3 1065 [336]
Subclass 3.1 267 [113] 3.2 163 [56] 3.3 10 [4] 3.4 317 [49] 3.5 171 [70] 3.6 109 [36] 3.7 10 [4] 3.8 10 [1] 3.9 1 [1] 3.10 2 [1] 3.11 2 [0] 3.12 1 [1] 3.13 2 [0]
Sub-subclass   3.2.1 140 [45] 3.2.2 23 [11]