CelluSpots™ are arrays of peptide-cellulose-conjugates spotted onto planar surfaces such as glass slides. Peptides are synthesized on individual disks consisting of a modified cellulose support which can be dissolved after synthesis. The solutions of individual peptides covalently linked to macromolecular cellulose are then spotted onto a surface of choice. Each disk is placed in a single well of a holding frame with 384 positions connected to the vacuum device of the MultiPep RSi instrument. Up to 768 peptides can be synthesized in parallel on two frames placed in the instrument. An upgrade kit with hardware and software is available. This procedure is subject to extensive licensing conditions.