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TEM of CHO cells incubated for 3 h with representative strains of Y. enterocolitica: 937 (biotype 1A, invasive) (A), AM5 (biotype 1A, noninvasive) (B), and W22703c (biotype 2, invasive) (C). Findings similar to those illustrated in panels A and B were observed with eight other strains of Y. enterocolitica biotype 1A, five invasive and three noninvasive. Bar = 1 μm.
