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It is possible to state as a general principle that the mesodermic phagocytes, which originally (as in the sponges of our days) acted as digestive cells, retained their role to absorb the dead or weakened parts of the organism as much as different foreign intruders.
— Elie Metchnikoff
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The cells are thus the stomachs of which the plant has millions like mouths.
— Lorenz Oken
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