cliparts/4/0/f/4/clipart-amino-acid-highlight-40f4.svg image/svg+xml Open Clip Art Library Amino acid (highlight) 2010-05-20T02:04:14 The general structure of amino acids, protein's building blocks, with the constituting groups highlighted: in green, the amino group; in yellow, the carboxyl group; in blue, the alpha carbon; and in red, the R group (a.k.a. side chain), which is the only thing that differentiates one amino acid from another. Drawn in Inkscape. http://openclipart.org/detail/61279/amino-acid-(highlight)-by-j_alves J_Alves acid amino amino acid biology chemistry clip art clipart formula model science structure