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Time course of colony forming unit analysis of GFP-tagged B. anthracis (Ba), Y. pestis (Yp), B. mallei (Bm), and B. pseudomallei (Bp) after phagocytosis by THP-1 macrophages (n = 3). The stars (*) above the bars at the 72 h time point indicate a significance level of P < 0.05.
