Sequence alignment of sequences belonging to the plant HQT family. NP_001234850 from tomato (Sl), ABA46756 from potato (St), CAE46932 from tobacco (Nt), BAA87043 from sweet potato, ABO77957 from coffee (Cc), ABK79689 from globe artichoke (Cca), ADL62854 from globe artichoke (Cca-A1), and ADL62855 from globe artichoke (Cca-A2). Black box indicates His-276 in SlHQT and equivalent residues in HQT enzymes from other plant species.