Fig. 4

Emission and excitation of QD-labeled CC49. a Naked QDs and QD-labeled CC49 were excited from 200 to 400 nm. A distinctive small absorbance peak around 280 nm was observed on the QD-labeled CC49. b Naked QDs and QD-labeled CC49 were excited at 365 nm. Emission was observed with a UV laser. c The emission peaks of QDs and QD-labeled CC49 were formed at 620 nm. The results of three independent experiments showing a similar trend are depicted