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Multiple correspondence analysis (MCA) graph depicting the results of MCA of 13 physical and chemical categorical variables of 7 amino-acid residues of the hypervariable E region of VSD and non-VSD FCV strains from Table 4. * Most common amino-acid configuration of FCV_VSD and FCV_URTD reference strains (see Table 4); E-ITA, enteric FCV strains (see Table 4).
