Amino acid sequences of 285 and 286 residues, respectively, were deduced for mouse and human BM-40 from cDNA clones isolated from expression libraries. The sequences showed 92% identity and were also essentially identical to those of bone osteonectin and of the parietal endoderm protein SPARC. About 60% of the mouse BM-40 sequence was confirmed by Edman degradation. Two of the seven disulfide bonds were localized which apparently separate two distinct domains of mouse BM-40.
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Lankat–Buttgereit et al. (1988) studied this question.
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