Keywords
amino acid, artwork, atomic, ball and stick, ball-and-stick, biology, chemical, chemistry, cut out, cut outs, cut-out, cut-outs, cutout, cutouts, essential amino acid, histidine, human biology, illustration, matter, molecular model, molecular structure, molecule, white background, zoology, stock illustration, royalty free illustrations, stock clip art icon, stock clipart icons, logo, line art, EPS picture, pictures, graphic, graphics, drawing, drawings, vector image, artwork, EPS vector arts, fine art prints, print, poster, posters, mural, wall murals, u80573190