Fluorescence scan of an array of 1024 peptides in a 1.6-cm2 area. Each synthesis site is a 400-μm square. A fluorescently labeled monoclonal antibody was added to the array to identify peptides that are recognized. The height and color of each square denote the fluorescence intensity.
[Information from S. P. A. Fodor et al., Science 251(1991):767.]