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[The primary structure of a dimeric hemoglobin (erythrocruorin); component CTT VI of Chironomus thummi thummi, Diptera (author's transl)].

The complete amino acid sequence of 147 residues was determined automatically for a major dimeric component (CTT VI) of the insect larva Chironomus thummi thummi (Diptera). The molweight was found to be 32411. All tryptic, maleylated tryptic and cyanogen bromide peptides were isolated. The handling of some large fragments was facilitated by maleylation and subsequent ion exchange chromatography. Some details of the primary structure are discussed. The alignment of the amino acid sequence with that of human alpha-chains shows only 29 identical positions.