Figure 1.

Similarity scores of among groups. Three kinds of pair-wise similarity scores (^gS_i,1, ^gS_i,2, ^gS_i,3) are plotted in two dimensional space to show clear differences among groups. Groups 1, 2 and 3 are each well separated; the results show clearly that the receptor sequences from cases of cross-species infection are well distinguished from those of other infection cases.