1.

Protein samples are now routinely enriched with which of the following isotopes to simplify the NMR data?

A. <sup>1</sup>H and <sup>31</sup>P
B. <sup>31</sup>P and <sup>15</sup>N
C. <sup>1</sup>H and <sup>15</sup>N
D. <sup>13</sup>C and <sup>15</sup>N
Answer» E.


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