REAGENTS FOR SCIENTIFIC OR MEDICAL RESEARCH USE, NAMELY, DIAGNOSTIC REAGENTS FOR SCIENTIFIC OR RESEARCH LABORATORY USE, REAGENTS FOR THE TRANSFER OF BIOLOGICAL MOLECULES INTO CELLS AND BIOLOGICAL REAGENTS CONTAINING BIOLOGICALLY ACTIVE MOLECULES FOR THE TRANSFER OF THESE MOLECULES INTO CELLS; CHEMICAL PREPARATIONS IN THE NATURE OF FILTERING MATERIALS FOR FILTRATION OF SOLUTIONS CONTAINING BIOLOGICAL MOLECULES AND/OR CELLS