FIGURE 1: Phylogeny of Penicillium species screened by PCR for the presence of Wallaby.

Several species occurring in the cheese environment (in red), either as desired or contaminant species, carry Wallaby. The structure of Wallaby is represented on the right hand side: the 575 Kb genomic island is in a single block in P. roqueforti (bar plot in the middle) while it is fragmented and located in non-homologous regions in P. camemberti (below) and P. rubens (above).