Figure 2. The design of fluorescent probes on the basis of QDs and 425scFv (a, green antibody) or 4D5scFv (b, blue antibody) for specific cancer cell imaging.

Binding of QDs to scFv antibodies via barnase-barstar molecular adaptors (A) and BBS-based molecular constructor comprising of a set of variable fluorescing and targeting modules (B) are shown.