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Color enhanced scanning electron micrograph of Eustoma pollen grains. Eustoma, commonly known as Lisianthus, is a genus of three species in the family Gentianaceae. Lisianthus flowers are either single or double-flowered and can be found in a range of colors. Pollen grains, containing the male sex cells (gametes), are reproductive structures produced by the male parts of flowering plants. Magnification 200x when printed 12.7cm (KEYSTONE/SCIENCE SOURCE/Nano Creative)