highly significantP =0.001
For both matrix data sets (strains, n =127 and ST, n =60), a highly significant correlation between the Euclidean distance of peptide occurrence and geographic distance was found (strains: n =127, correlatio n =0.36, t =7.79, two-tailed P =0.001; ST: n =60, correlatio n =0.26, t =3.1, two-tailed P =0.002).