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Plato (left) and Aristotle, detail from School of Athens, fresco by Raphael, 1508-11; in the Stanza della Segnatura, the Vatican. Plato points to the heavens and the realm of Forms, Aristotle to the earth and the realm of things.

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subtilisin

biochemstry

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work of Arnold

In Frances Arnold
She altered the enyzme subtilisin E, which breaks down the protein casein, so it would work in the solvent dimethylformamide (DMF) instead of in the watery environment of a cell. She introduced many random mutations into the genetic code of bacteria that made subtilisin E, and she introduced her
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