Figure 2

Species distribution, physico-chemical signatures and proteins conservations. Factorial plane representation and species colour coding are as in Figure 1 (species are only reported with their positions; see legend for colour coding symbols in Figure 1A). Amino acids (one letter) are in green. The three pools for polar (POL), charged (CHAR) and hydrophobic (HYD) amino acids are reported in black. The positions of the subsets corresponding to specific proteins (SPEC), as well as to proteins exclusively conserved in one (E, A and B) or in combinations of phylogenetic domains (EA, EB, AB and EAB) are reported in pink.