Although <sup>13</sup>C has a natural abundance of only 1.1% and gives inherently much weaker nuclear magnetic resonance signals than does does <sup>1</sup>H, it has been found that <sup>13</sup>C nuclear magnetic resonance spectra of aqueous solutions of naturally occurring proteins can be observed. A spectrum of hen's egg white lysozyme, an enzyme of molecular weight approximately 14 300, containing 129 amino acid residues, has been partially analyzed by comparison with a computer-simulated spectrum.

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