The primary structure of hemoglobins of Tetrahymena thermophila and T.
pyriformis was determined by peptide and cDNA sequence analysis. Thei
r sequences were 83.5% identical to each other and homologous to other
protozoan and cyanobacteria hemoglobins, but not to proteins of the g
lobin family. An intron was not present in the T. thermophila hemoglob
in gene.