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A deposition fixture is described for placing proteins and nucleic acids onto field-emitter tips from aqueous solution. The fixture allows the coverage of these species on each of four tips to be independently selected by an appropriate choice of deposition parameters. Common rinsing volumes can be used without cross contamination of the tips. Four tips can be dosed in 20 min, the time previously taken to cover one tip with biological molecules. The fixture makes molecular deposition from aqueous solution both simple and routine. [ABSTRACT FROM AUTHOR]