Figure. Prediction of source of origin within the sequence type ST-21 complex. A) Observed accuracy of prediction (arrow) compared with distribution of values obtained by permuting host labels so that the alleles varying from central genotype are not informative on host of origin. B) Prediction of origin by using only alleles for which substantial reference information is available. Light lines indicate alleles different from ST-21 present mainly in chickens in the reference population (i.e., an allele that would predict chicken origin); dark lines indicate alleles present mainly in bovids (i.e., predicts bovid origin). Light boxes indicate STs found only in chickens, dark boxes indicate STs found only in bovids, and boxes with light and dark shading indicate STs found in bovids and chickens.