Figure 3. Electron-dense organelles of P. françai observed in thin section. A: Thin section of P. françai promastigote showing profiles of the electron dense organelles. B,E: High magnification showing organelles partially ~B! or completely ~E! filled with electron-dense material, which is rich in phosphate, calcium, iron, and zinc ~D!. Tubular structures, resembling enlarged endoplasmic reticulum, containing an electron dense material were also frequently seen ~C!. In some instances, two or more inclusions could be seen within these organelles ~F!. G: Organization of the electron-dense material in concentric patterns. Bars: A: 400 nm; B: 150 nm; C: 200 nm; E: 120 nm; F: 90 nm; G: 90 nm.
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