Nitrogen Isotope Effects in Urea Metabolism: From Biochemistry to <sup>15</sup>N Natural Abundance in Cancer.

Also, it is important to remember that the isotope effect associated with deprotonation of –NH 3 + groups to –NH 2 is highly significant, about 1.022 in amino acid NH 2 groups [ 104 ] and 1.019 for free ammonia [ 106 ].

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