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Fig. 4
Confocal microscopic images of four different negatively charged RITC-conjugated mesoporous silica nanoparticles (RMSNs) with different sizes (50 and 200 nm) in zebrafish larval midbrain. White arrows indicate mesencephalic central arteries (MCtAs); arrowheads indicated red fluorescence (RITC) of nanoparticles outside the brain’s blood vessels (GFP, green).
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