Fig. 5
a The plasma RHE concentration–time curves of injected RHE, RHE/DOX and RD NPs (n = 6, mean ± SD). b The plasma DOX concentration–time curves of injected DOX, RHE/DOX and RD NPs (n = 6, mean ± SD). c Ex vivo images of tumors and major organs at 12 h and 24 h post-injection. d Confocal images of frozen tumor sections collected after 24 h. DOX is shown in red, and the nucleus is shown in blue (DAPI)