Balance of reactants and products that participate in a chemical reaction.
For most metabolically important reactions substitute "substrates" for reactants. That is, for example,
W(substrate 1) + X(substrate 2) → Y(product 1) + Z(product 2),
where the letters W, X, Y, and Z represent the relative amounts of each participant in this hypothetical reaction.
Also for example, C6H12O6 + 6O2 → 6CO2 + 6H2O + energy, which is the oxidation of glucose.
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