Assertion: amino acid alanine | /r/HasProperty | a protein amino acid
Facets:
Source sentences:
text: Later the amino acid alanine, which is also a protein amino acid, was found to have an excess of the L-configuration, which led several scientists to suspect terrestrial contamination according to the argument that it would be "unusual for an abiotic stereoselective decomposition or synthesis of amino acids to occur with protein amino acids but not with non-protein amino acids".