10 gen 1838 anni - Theodor Schwann - was known for his role in the cell theory and his role consisted of 1838 the extension of cell theory in the category of animals. Which included the Central idea (All living things are made up of cells), Collaboration with Schleiden (where Schleiden focused on plant cells and Schwann on animal cells), and Historical significance (Schwann's research helped to solidify the understanding that cells are the fundamental building blocks of life).