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Side-by-side labeled diagrams of a typical animal cell and a plant cell, showing internal structures such as nucleus, mitochondrion, endoplasmic reticulum, and unique features like chloroplasts and cell wall in the plant cell. Robert Hooke's drawings Matthias Jakob Schleiden Portrait of Theodor Schwann, a middle-aged man with short hair and sideburns, wearing a dark suit, waistcoat, and bow tie, facing slightly to the left.
Robert Hooke's Discovery: The Microscopic World of Cells
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Robert Hooke's Discovery: The Microscopic World of Cells
This was a game-changer.
Video: Encyclopædia Britannica, Inc.

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Organelles of eukaryotic cells
A defining feature of eukaryotic cells is the presence of membrane-bound organelles...
Encyclopædia Britannica, Inc.
Robert Hooke's drawings
Robert Hooke's drawings of the cellular structure of cork and a sprig of sensitive...
From Micrographia, by Robert Hooke, 1665
Matthias Jakob Schleiden
Matthias Jakob Schleiden.
From The Popular Science Monthly, Volume XXII, by E.L and W.J. Youmans, November 1882-April 1883, published by D. Appleton and Company, New York.
Theodor Schwann
© Hulton Archive/Getty Images
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