FSHB and neoplasm: The FRET-specific fluorescence for both tumor and harvest organs of the complementary group were more than twice as high as the noncomplementary group (DCNPs-L1(Cy5)-FSHβ + DCNPs-L1(Cy7)-FSHβ) (Fig. 3e; Supplementary Fig. 15), demonstrating the colocalization assembly of the two complementary components can occur within tumors.