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Fig. 3. Sequence analysis of Atlantic cod GLUT1. Amino acids are represented by the
single letter code and numbered on the right. Boxes numbered with Roman
numerals represent the putative 12 transmembrane helices. Residues that are
highly conserved in all glucose transporters are highlighted in gray, while
those that are specific to class I glucose transporters are highlighted in
black. It should be noted that the PETKGR motif varies in Atlantic cod GLUT1
in that the K is substituted by an R.