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. Author manuscript; available in PMC: 2014 Nov 1.
Published in final edited form as: Curr Opin Chem Eng. 2013 Nov;2(4):10.1016/j.coche.2013.08.009. doi: 10.1016/j.coche.2013.08.009

Figure 1.

Figure 1

Schematic for molecular imaging agent development. Several scaffolds have been validated for in vivo molecular imaging. Selection of an appropriate scaffold, followed by directed evolution – for binding and delivery characteristics – and radiolabeling yield an imaging agent with potent delivery and retention properties capable of producing high contrast molecular images.