the observed distribution of deuterium-enriched species of cholesterol corresponded to a distribution that was calculated based on c = 27 , 13c = 1.107 % , d2o/h2o = 0.25 , hydrogen derived from water = 20 , and is in agreement with the concept that deuterium incorporation occurs randomly and represents mostly the nadpd/nadph ratio in the medium .
C0020275
hydrogen
C0011744
deuterium