Schematic representation of a two-step<unk> approach.<unk> (imaging) is a tool for nuclear medicine and radiotherapy. Imaging studies require a high contrast of target to background. This can be provided by using a biomarker which has a high affinity and specificity for its target (e.g. an antibody).
Pretargeting 
Biofunctionalisation
Center-surround antagonism
Honeycombing
Functional integration 
Saponification
Accommodative convergence
Priming 