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Cells

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TAILOR-MADE  A semisynthetic strain of Escherichia coli makes glowing green proteins using amino acids not found in nature.

brain

ANOTHER WRINKLE  The outer layer of the human brain has distinctive folds. Work with brains growing in lab dishes is showing how the structures may form.

ribosome

STANDING OUT  Scientists used to think that ribosomes, molecular machines that build proteins, are identical and interchangeable. But the micromachines are more diverse than previously thought, new research suggests.

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