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Samples of a sta6 culture, boosted with 20 mM acetate after 48 h NF and centrifuged at 10,000 × g for 5 min at 2, 3, 4, 5, and 8 days postboost. Micrographs show phase and bright-field (lower right) microscopy. Asterisk, cellular debris. Bars, 10 μm.
