Table 1

Overview of gene categories
Category
 G
 Cr
 O1
 O2
 Suggested content of imports
A
 +
 -
 -
 -
 Recent imports or loss of imports from B
B
 +
 +
 -
 -
 Less recent imports
C
 +
 -
 +
 +
 Loss of genes in Cr, or pervasive imports
D
 +
 +
 +
 +
 Only highly pervasive imports expected

G, genome under consideration; Cr, paired close relative; O1, first outgroup organism; O2, second outgroup organism. +, Present; -, absent.

Hooper and Berg Genome Biology 2003 4:R48   doi:10.1186/gb-2003-4-8-r48

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