THE AMINO ACID SEQUENCE OF MYOGLOBIN FROM THE MOLLUSC Aplysia limacina

The amino acid sequence of the globin prepared from the myoglobin contained in the radular muscle of the gasteropod mollusc Aplysia limacina was determined. According to the results thus obtained, the polypeptide chain of Aplysia limacina myoglobin is composed of 145 amino acid residues, in good agreement with the overall number of amino acid residues contained in the polypeptide chain of the vertebrate myoglobins studied to date. A particularly interesting feature of the myoglobin studied appears to be the presence in its polypeptide chain of only one histidine which occupies the 95th position.