sentence: Among 153 amino acid residues in Dke1 , 52 residues were conserved in all 28 proteins , and referred to as definitely conserved sites ( highlighted in red in Fig. 3 ) ; 44 amino acid residues appeared in more than 14 other proteins , and defined as relatively conserved sites ( highlighted in yellow in Fig. 3 ) ; and 19 amino acid residues rarely ( less than 26 % ) showed up in other proteins , and were called variable sites ( highlighted in green in Fig. 3 ) .