a German botanist, Schwann proposed the cell theory. The cell theory has three parts: 1. All organisms are composed of cells. 2. Cells are the basic units of structure and function in organisms 3. All cells come from preexisting cells. The impact on science was very great due to the discovery of cells and the cell theory.

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    Schwann cells or neurolemmocytes (named after German physiologist Theodor Schwann) are the principal glia of the peripheral nervous system (PNS). Glial cells function to support neurons and in the PNS, also include satellite cells, olfactory ensheathing cells...

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    microscopes to study plant tissue. In 1838, he proposed that plants are made of cells. Schleiden discussed the results of his work with another German scientist, Theodor Schwann, who was struck by the structural similarities between plant cells and the animal cells he had been studying. Schwann concluded that all animals are made of cells.

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