An assembly for holding circuit cards may comprise a plurality of slots, each slot being configured to receive a circuit card. The modulators of the invention comprise a peptide, preferably based on a amyloid peptide, that is comprised entirely of D-amino acids. The plate member has a plurality of apertures therethrough arranged in at least one group of four radial aperture lines. Additional divider members can be added to the restraining straps as desired for creating cargo receptacles therein as needed.