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Zebrafish injected with red fluorescent HeLa cells in the yolk (A, E, C and G). The results are shown for less bright functionalized fluorescent particles (B) SiFB-PEGFA, (D) SiFB-PFFA and for ultrabright functionalized particles (F) SiSB-PEGFA and (H) SiSB-PFFA injected behind the eye of the zebrafish.
