Classifier transfer across species boundaries. The median AUC for 13 functional classes is shown. The 'training species' is shown in the rows, the 'test' species in the columns. It can be seen that classifiers perform almost as well on a 'foreign' species as they do on the species they were originally trained on (diagonal). Performance is worst for the classifiers from T. pallidum, U. urealyticum and M. genitalium, and in these three cases the classifiers from the other four species give significantly better performance than those from the original species (sign test, p < 0.001).