thus reveals (as, for example, by an absence of staining, etc.) the presence of ligand that is bound to a protein of the biological sample [0083] ???Detector??? means a molecule, such as an antibody or DNA probe, that is free in solution (i.e. not anchored to a membrane) and has an affinity for one of the sample components. [0084] ???Direct capture??? means the conjugation or binding of a biomolec