bookmark IsoCor A scientific software tool designed for the purpose of isotope labeling experiments (ILE). IsoCor correct raw MS data (isotopic clusters) for the contribution of all naturally abundant isotopes. The output of IsoCor is the isotopologue distribution – i.e. the relative fractions of molecular entities differing only in the number of isotopic substitutions – of the molecule. IsoCor also calculates the mean enrichment – i.e. the molecular content in the isotope – in metabolites or their fragments.