Summary
It has been found that clupein, purified by a fractionation of its aqueous solution in the cold, contains only arginine, serine, alanine, valine and proline as constituents, and that a proline residue is placed at the amino end of the peptide chain of its molecule.
References
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Waldschmidt-Leitz, E., Kühn, K. & Zinnert, F. Zur Bausteinanalyse des Clupeins. Experientia 7, 183–184 (1951). https://doi.org/10.1007/BF02148906
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DOI: https://doi.org/10.1007/BF02148906