aug 1, 1855 - Rudolph Virchow- In 1855, Virchow, a German physiologist added to the 3rd part of the cell theory. "All cells develop only from preexisting cells". He was also the first to propose that diseased cells come from healthy cells.

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Rudolf Virchow, a German translates as all cells develop only from existing cells. Virchow was also the first to propose that diseased cells come from healthy cells.

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