FIG. 4.

PlcR peptide sequences can be divided into four clusters to which the four PapR classes correspond. This phylogenic tree was built on the basis of PlcR peptide sequences from strains belonging to the PlcR group, using the ClustalX and Treeview programs. The sequences were determined and the abbreviations used are as described in the legend of Fig. 2. The colors designate individual PlcR clusters with which a PapR class is associated: orange indicates PapR LPFE(F/Y), pink indicates PapR VP(F/Y)E(F/Y), purple indicates PapR MPFEF, and green indicates PapR LPFEH.