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Fig. 6. —MR imaging detection of ß-galactosidase messenger RNA expression in living Xenopus laevis tadpoles. Gadolinium is initially enclosed in chemical cage. When cage encounters enzyme ß-galactosidase, protective gate is cleaved open, exposing gadolinium (purple) to water and causing signal enhancement. ß-galactosidase messenger RNA expression is seen in eye (e), cement gland (c), brachial arches (b), and somites (s). (Reprinted with permission from [27])





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