Alignment of glycerol kinase protein sequences across species. Limits of each human exon are labeled below the aligned sequences. F, fructose 1,-bisphosphate binding site; P, phosphorylation site; G, glycerol binding residue; *, residue mutated in patients with GKD; M, magnesium binding residue; A, ATP binding residue; SSS, SUMOylation sequence; LXXLL, coactivator interaction domain; LL, dileucine repeats; N, nuclear localization sequence; PXDLS, CtBP binding site. The protein residues encoded by each exon are labeled below the sequences.