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Relative molecular weight distribution for purified native Bombyx mori silk fibroin (B) and recombinant human tropoelastin (C), as displayed by gel electrophoresis. While the extracted fibroin proteins present as a broad range of peptide fragments, recombinant human tropoelastin has a defined molecular weight of approximately 55 kDa. The left lane (A) shows a selection of molecular weight markers.
