Alignment of trematode globin sequences with sequences of known tertiary structure. Ho.sa.Mb, Homo sapiens Mb (NP005359); Ho.sa.Hbα, Homo sapiens Hbα (P69905); Ho.sa.Hbβ, Homo sapiens Hbβ (P68871); As.suD1, Ascaris suum Hb domain 1 (1ASH); Pa.ep., Paramphistomum epiclitum Hb (1H97B); Di.de, Dicreocoelum dendriticum Hb (P56532); Ga.cr., Gastrothylax cruminifer Hb; Is.hy., Isoparorchis hypselobagri Hb (P80722); Sc.ja., Schistosoma japanicum Hb (AAP06216); Pa.we.1, Paragonimus westermani Hb1 (AAX11352); Pa.we.2, Paragonimus westermani Hb1 (AAX11353); Cl.si., Clonorchis sinensis Hb (AAM18464); Fa.he., Fasciola hepatica Hb (EU124670). The accession numbers given are from NCBI. (*) Alignment purpose; (−) missing residues; (→) intron insertion position. Positions identical in all trematode globin sequences are highlighted.