Protein Interactions Extracted from Genomes and Papers

A compact and low profile document handling unit with short and simple document recirculation paths for recirculating a set of original document sheets to and from one side of the platen of a copier with or without inversion for selective repeated copying of one or both sides of the documents, in which the selectable document inverter in the document recirculation path includes a generally planar document sheet reversing chute which is generally parallel to and closely overlying the platen and a sheet reversing feeder adjacent the same side of the platen for feeding the document sheets into the reversing chute directly from the platen, but inverted, and for feeding them out of the reversing chute to a restacking tray at that same side of the platen without inversion.