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. 2011 May 2;108(20):8329–8334. doi: 10.1073/pnas.1105168108

Table 2.

DF counts

Phylogroup set symbol Feature count
U = Universal set 8,390,656
V = A ∪ B1 ∪ B2 ∪ D ∪ E ∪ A 8,224,172
V′ 166,484
A 2,727,759
B1 2,848,252
B2 2,691,012
D 2,742,919
E 3,505,791
S 2,153,098

The set notation corresponds to the features in each phylogroup. ∪ is the union, and V′ represents the complement of V, i.e., those features not present in V but part of U.