360 MHz 1H NMR was used to monitor the changes of AKR mice thymus lymphocytes in cases of spontaneous and transplantable leukemia and vincristine administration. A comparison of relative signal intensities of methyl and methylene fatty acid chains protons and phosphatidylcholine headgroups protons enables to monitor leukemia development and vincristine effect. Spin-lattice relaxation curves of the same protons of leukemic thymi lymphocytes are well fitted by biexponential functions, bringing evidence for two regions with different lipid mobility.
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