Fig. 3.

(A) Colour and (B) photoluminescence image of retracted armpit area following QD administration. QDs were injected subcutaneously into the left paw and the rat was sacrificed 10 min post-injection. Tissues were illuminated with a collimated LED lamp with peak emission at 455 nm (acquisition time: 0.1 s) and the QDs photoluminescence signal was recorded using a colour CCD camera. The green emission in (B) corresponds to tissue autofluorescence, and the red to the QDs photoluminescence in axillary and thoracic lymph nodes.