Allocation of B. cenocepacia strain J2315 σ 70 deduced factors into the main σ 70 gene family phylogenetic groups. All Bcen-J2315 deduced amino acids sequences from σ70 coding sequences were added to the frame of the Lavire et al.  multiple alignment. A Neighbor-joining phylogenetic tree was computed from this multiple alignment. Distances on this tree are proportional to evolutionary divergences expressed in substitutions per 100 sites. The Bcen-J2315 sequences were allocated to one of the following phylogenetic groups: group 1, the essential primary factors, and alternative primary factors of the actinobacteria; group 2, stationary phase factors of the RpoS type; group 3, factors involved in heat shock response, flagella synthesis or cellular differentiation, and group 4, factors involved in extracytoplasmic functions (ECF).