A high-affinity hemoglobin is expressed in the notochord of amphioxus, Branchiostoma californiense.

The Biological Bulletin | December 1, 1998| | Copyright

Among the metazoa, Hbs are known to exist in members of 12 of the 33 phyla of animals (1,2). In the phylum Chordata, although Hb is nearly universally expressed in members of the subphylum Vertebrata, it has not been identified in any members of the subphyla Urochordata or Cephalochordata. However, these groups of animals share a common ancestor with the vertebrates (3), who inherited the Hb gene from the common ancestor (4,5). Recently, two of us (Doeller and Kraus) observed absorption spectra characteristic of Hb from the notochord of amphioxus from the Gulf of Mexico, ...

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