Assertion: amino acid's carbon atom | /r/AtLocation | amino group
Facets:
Source sentences:
text: An amino acid consists of an alpha carbon atom attached to an amino group, –NH 2 , a carboxylic acid group, –COOH (although these exist as –NH 3 + and –COO− under physiologic conditions), a simple hydrogen atom, and a side chain commonly denoted as "–R".