Abstract: Arrays of polynucleotide or polypeptide target molecules immobilized on a surface of a substrate where the target molecules are arranged in the array according to intensity of organism expression of cognate probe molecules which hybridize to the target molecules. For instance, target molecules having a higher than average indicia of hybridization, e.g. at least a factor of 2, are segregated at a peripheral region of the substrate and at a lower surface density. Preferred arrays can contain animal, plant or microorganism target molecules including Aspergillus nidulans. Diagnostic arrays can comprise targets from mixed species, e.g. human, mouse and virus; plant breeding arrays can comprise targets from mixed plants, e.g. Arabidopsis thaliana, maize, soy, cotton, wheat, rice, canola and potato.