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Immunofluorescent staining of Bartonella cells. (A) B. vinsonii subsp. arupensis stained with anti-Bva 6.1; (B) B. quintana stained with anti-Bva 6.1; (C) B. vinsonii subsp. arupensis stained with preimmunized mouse serum. Arrows in panel A point to the concentrated staining in the polar regions of the cells. Magnification, ×1,000.
