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Representative fluorescence images of C57BL/6 mice after receiving one administration of free Cy5-BSA (A), Cy5-BSA@CaCO3 (B), Cy5-BSA@CaCO3/(TA/PEG)20 (C), Cy5-BSA@CaCO3/(TA/PEG)40 (D), and a mixture of Cy5-BSA@CaCO3, Cy5-BSA@CaCO3/(TA/PEG)20 and Cy5-BSA@CaCO3/(TA/PEG)40 (E).
