ImaginAb facilitates the promise of personalized medicine through creation of companion diagnostics for patient stratification and targeted molecular therapy. ImaginAb’s technology enables antibodies to be re-engineered into smaller proteins (fragments) with rapid kinetics suitable for diagnostic imaging, while maintaining target biospecificity. In this way true companion in vivo diagnostics can be developed that enable target expression to be profiled in tissues in a non-invasive, whole-body manner.