The Primary Structure of the Hemoglobins of a Southern Hemisphere Lamprey(Mordacia mordax,Cyclostomata)

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Abstract
Mordacia mordax is a southern hemisphere lamprey belonging to Mordaciidae, a primitive family of Cyclostomata. Adult erythrocytes contain three monomeric hemoglobins which can be easily separated by cellulose acetate electrophoresis and isolated by ion-exchange chromatography. The N-terminal regions, and the tryptic peptides from each chain were submitted to automated Edman degradation; the alignment of the fragments was obtained by homology with the other Petromyzonoidea hemoglobins hitherto sequenced. Our results confirm the phylogenic distance between lampreys and hag-fish hemoglobins. As was observed for Petromyzon marinus species, two hemoglobins of Mordacia mordax are very close, as they differ only at 7 positions.