"The elementary parts of all tissues are formed of cells in an analogous, though very diversified manner, so that it may be asserted, that there is one universal principle of development for the elementary parts of organisms, however different, and that this principle is the formation of cells."

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Source : Theodor Schwann (1847). “Microscopical Researches Into the Accordance in the Structure and Growth of Animals and Plants”, p.165

Theodor Schwann

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