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musculin

musculin Chem.
  (ˈmʌskjuːlɪn)
  Also -ine.
  [f. L. mūscul-us muscle n. + -ine.]
  The basis of animal muscle; syntonin; also, see quot. 1891.

1864 Webster, Musculine. 1866 A. Flint Physiol. Man I. 90 Musculine. This semi-solid organic principle is peculiar to the muscular tissue. Ibid. 91 Musculine, in combination with inorganic substances, goes to form the muscles. 1891 Halliburton Chem. Physiol. 413 Paramyosinogen. Note. Termed musculin by Hammarsten.

Oxford English Dictionary

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