Improvements in or relating to methods of screening substances

摘要

Disclosed is a method of screening substances for reduced ability to bind to a specified target molecule. The method involves the display of a first member of a specific binding pair ("sbp") on the surface of a viral display package, and contacting the viral display package with a target cell expressing a receptor molecule and the second member of the sbp in such a way that viral display packages displaying first members of the sbp which have been altered so as to inhibit binding to the second member of the sbp tend to infect target cells more successfully than those display packages displaying first members of the sbp which have unaltered binding affinity for the second member of the sbp. Also disclosed is a kit for use in performing the method of the invention.