character: Theodor Schwann
topic: Contributions to Cell Theory
grade: 9
subject: Biology
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character: Matthias Schleiden
topic: Collaborations in Developing Cell Theory
grade: 9
subject: Biology
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character: Theodor Schwann
topic: Development of the Cell Doctrine
grade: 9
subject: Biology
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character: Matthias Schleiden
topic: Plant Cells and the Foundation of Cell Theory
grade: 9
subject: Biology
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