Alignment between the derived MUR1 amino acid sequence and putative GDP-d-mannose-4,6-dehydratases. Identical residues are shaded in gray and conserved residues are boxed. Positions of the amino acid substitutions from seven mur1 alleles are indicated above the Arabidopsis sequence. A.t., A. thaliana; M.t., Mycobacterium tuberculosis; P.a., Pseudomonas aeruginosa; PBCV, Paramecium bursaria Chlorella virus; Y.e., Yersinia enterocolitica; V.c., Vibrio cholerae; and E.c., E. coli. Sequence alignments were done with clustal w and viewed with seqvu.