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Transmission electron micrographs showing glycogen staining of chemically fixed, Epon-embedded thin sections of “Ca. M. fumariolicum” cells in transition phase II. (A) Glycogen staining is seen in the otherwise electron light particles abundantly present in the cytoplasm. (B) Zoom-in of the box drawn in (A). (C) Negative control incubated with water instead of periodic acid. Scale bars, 100 nm.
