Living organisms synthesize a staggering variety of proteins by combining 20 amino acids into chains of any length and order. In the past, to expand protein diversity beyond the scope of these 20 ...

The genetic code is the recipe for life, and provides the instructions for how to make proteins, generally using just 20 amino acids. But certain groups of microbes have an expanded genetic code, in ...

Unexpected genetic twist: A newly identified freshwater ciliate uses two standard stop codons to build amino acids, a combination not seen before. Why it matters: The discovery challenges the ...

Scientists trying to engineer biologic molecules with new functions have long felt limited by the 20 amino-acid building blocks. Researchers are working to develop ways of putting new building ...

Scientists at UC Berkeley have discovered a microbe that bends one of biology’s most sacred rules. Instead of treating a specific three-letter DNA code as a clear “stop” signal, this methane-producing ...

Unexpected genetic twist: An Oxford pond protist was found to repurpose two universal stop codons, coding for lysine and glutamic acid instead. Why it matters: The discovery challenges the 'universal' ...