Researchers engineered bacteria that successfully break life's fundamental 20-amino-acid rule, suggesting proteins can function with fewer building blocks.
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Life with one less: Engineered bacteria break the 20-amino-acid rule
20 Canonical amino acids
19 Amino acids in engineered bacteria
Life'S 20-Amino-Acid Code May Not Be Chemically Mandatory Discovery implication
Universal Genetic Code rule broken
19 Of 20 amino acids used