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Embryonic plant cells, 19th century illustration
Illustration of various types of embryonic plant cells and tissues from Beitrage zur Botanik (Contributions to Botany) published in 1844 by the German botanist Jakob Matthias Schleiden (1804-1881). Schleiden was a co-founder of cell theory with the German physiologist Theodor Schwann. Schleiden's studies convinced him that all plant or animal structures are composed of cells or their derivatives and that cells are the fundamental unit of life., by WELLCOME IMAGES/SCIENCE PHOTO LIBRARY
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