Schematic representation
of the functional distribution of phylogenetic connections derived
from six microbial phylomes. In, informational
genes; Op, operational genes. The following gene category abbreviations
are used: A, amino acid synthesis; B, biosynthesis of cofactors;
C, cell envelope proteins; E, energy metabolism; I, intermediary
metabolism; L, fatty acid and phospholipid biosynthesis; N, nucleotide
biosynthesis; O, other; P, cell processes; R, replication; S, transcription;
T, translation; X, transport; Y, tRNA synthesis; Z, regulation.