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SPB morphology in spo74Δ/spo74Δ cells. Cells from strains MYA-2089 (wild type) (A), MYA-2047 (mpc70Δ/mpc70Δ) (B), and MYA-1898 (spo74Δ/spo74Δ) (C and D) were induced to enter meiosis and processed for electron microscopy. Open arrow, prospore membrane in wild-type cell; closed arrow, MOP in wild-type cell; arrowheads, central plaques. Bars, 50 nm.
