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Background  The microarray has contributed to developing the omic analysis. However, as it depends basically on the surface reaction, it is hard to perform bulk reactions and sequential multistep reactions. On the other hand, the popular microplate technology, which has a great merit of being able to perform parallel multistep reactions, has come to its limit in increasing the number of wells (currently, up to 9600) and reducing the volume to deal with due to the difficulty in operations.    Results  Here, we report a novel microarray technology which enables us to explore advanced applications, termed  microarray-with-manageable volumes  (MMV). The technical essence is in the pipette-free direct parallel transfer from well to well performed by centrifugation, evading the evaporation and adsorption-losses during handling. By developing the MMV plate, accompanying devices and techniques, generation of multiple conditions (256 kinds) and performance of parallel multistep reactions, including PCR and  in vitro tr anslation reactions, have been made possible. These were demonstrated by applying the MMV technology to searching lysozyme-crystallizing conditions and selecting peptides aimed for Aβ-binding or cathepsin E-inhibition.    Conclusions  With the introduction of a novel concept microarray (MMV) technology, parallel and multistep reactions in sub-μL scale have become possible.

Novel concept microarray enabling PCR and multistep reactions through pipette-free aperture-to-aperture parallel transfer