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Phase-contrast microscopy showing that B. thuringiensis subsp. thuringiensis IS5056 colonizes and sporulates in dead larvae of T. ni. Third-instar larvae were fed a spore-crystal mixture of IS5056, after which larval tissues were examined by phase-contrast microscopy at 48 h (A) and 7 days (B and C). (A and B) Magnification, ×400. (C) Magnification, ×1,000.
