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(a) T2 map of cells in NMR tubes, (1) water, (2) agarose 0.5%, (3) F127- Folate coated SPION in folic acid media,(4) F127-Folate coated SPION in free Folic acid media, (5) F127 coated SPION, (6) cells in 0.5% agarose. (b) T2 and T2* value from T2 map (a) and T2* map (images not show). Number of cells: 4.5 x 105 cells/ 200 µL in 0.5 % agarose.
