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These ranges come from animal-data extrapolation and informal reports, not controlled human trials, and the two routes are not directly interchangeable
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Tetrapyrroles Birth, Life and Death
Indirect Calorimetry and Respiratory Exchange Ratio Indirect calorimetry estimates energy expenditure and substrate use from oxygen consumption and carbon-dioxide production
[21] Within cells, cyanocobalamin is converted to methylcobalamin and 5- deoxyadenosylcobalamin, coenzymes that participate respectively in homocysteine remethylation to methionine and in the isomerization of methylmalonyl-CoA to succinyl CoA, reactions essential for DNA synthesis, erythropoiesis, and myelin maintenance
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