Genes related to metal resistance. A) Genes correlated to copper resistance were found on plasmids C and D of L. lactis SK11. B) L. lactis MG1363 genes that were found to be correlated to arsenite resistance. C) Gene-to-strain relations for L. lactis MG1363 genes shown in B. Colours represent strength of relationship (Figure 1) between a gene and a phenotype for A and B, but between a gene and a strain for C. Phenotypes are shown as the final digits in column names, where 0 indicates there is no resistance and other numbers indicate different resistance levels in different experiments as described in the Additional file 1. For gene annotations see Additional file 3.