The cause of nutrition and growth resides not in the organism as a whole but in the separate elementary parts—the cells.

The cause of nutrition and growth resides not in the organism as a whole but in the separate elementary parts—the cells.

– Theodor Schwann –

Mikroskopische Untersuchungen Uber Die Ubereinstimmung in Der Struktur Und Dem Wachstum Der Tiere Und Pflanzen

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