TSP (Transferable Solid Phase) is similar to a 96 well plate lid with 96 attached pins. When a TSP unit is placed over a 96 well plate, the pins are immersed in the plate wells. The sterile TSP is useful when replating and screening 96 well plates containing transformants or library clones. A sterile TSP is available for screening hybridoma cultures or expression libraries. The TSP may be used to absorb mixed proteins or antibodies directly from cultures. Alternatively, when precoated with antigen or antibodies, a specific analyte from cultures may be assayed via efficient transfer of analyte from one plate to another. Analyte bound to the TSP can be assayed in the Nunc 96 well MicroWell plates.