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Analysis of outgrowth of Sterne and ΔexsY spores. Wild-type Sterne (WT) spores produced in liquid medium (A) and ΔexsY spores produced on solid (B) or in liquid (C) medium were allowed to germinate and outgrow in growth medium for 55 min at 37°C and then examined by phase-contrast microscopy. White arrowheads indicate some of the shells that encapsulated the outgrowing cells.
