The chemicals form when amino acids react with creatine, a chemical found in muscles.

VOA: special.2010.06.01

Amino acids have already been found in space rocks called meteorites.

VOA: special.2009.09.30

Glycine is one of the common amino acids.

VOA: special.2009.09.30

"Using x-ray crystallography to obtain snapshots of the ribosome in action, they have been able to explain how the ribosome selects and couples together amino acids to form proteins."

VOA: standard.2009.10.07