Figure 3.

(A) CACO-2 cells treated for 4 h with blank vehicle (0.1% v/v diethyl ether) and (B) with vehicle + SiQDs (0.2 $\mathsf{\mu }$g mL${}^{-1}$). The (orange–red) false color fluorescent image is superimposed on the bright field optical images indicating internalization of SiQDs in CACO-2.