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Phase-contrast and electron micrographs of parasporal inclusions of B. thuringiensis isolate 84-HS-1-11. (A) Phase-contrast photograph of a sporulating culture. (B) Transmission electron micrograph of a sporangium containing a maturated spore and a parasporal inclusion. S, spore; P, parasporal inclusion; E, electron-dense envelope. Bars, 10 μm (A) and 1 μm (B).
