highly significantP < 0.0001
In a Kruskall-Wallis analysis of the normalized frequencies of the Foa races 4 and 2 hetero- and homo-CATs, there were highly significant differences ( P < 0.0001) between the strains; the non-parametric Steel-Dwass multiple comparison test found highly significant differences ( P < 0.0001) between all pairs, i.e., there were highly significantly fewer (apparently non-existent) hetero-CATs than either homo-CATs, and there were highly significantly more homo-CATs of Foa race 2 than homo-CATs of Foa race 4.