A The structure of conjugate 4. B Confocal laser scanning microscopy (CLSM) images of PC3 cell after an overnight incubation with TPE-NPs of conjugate 4, including orthogonal views, left and top rectangular panels. C Representative noninvasive bioluminescence images of different treatment groups implanted with PLuc-expressing PC-3 tumors s.c. in SCID mice. D Growth response of human PC-3 tumors to different treatment regimens. Reproduced with permission .