Patent ID: 7556919

Claim:
A nucleic acid hybridization assay comprising the steps of: contacting at least one labeled target nucleic acid sample with an array under conditions sufficient to produce a hybridization pattern; and detecting said hybridization pattern, wherein said array comprises at least one pattern of different probe oligonucleotide spots covalently attached to the surface of a solid support, wherein the spots on said array have a density of at least 10/cm2 and each probe oligonucleotide spot of said pattern comprises an oligonucleotide probe composition made up of long oligonucleotide probes ranging in length from 60 to about 100 nucleotides, and further wherein each oligonucleotide probe composition is made up of long oligonucleotide probes that have less than 50% homology with oligonucleotide probes of any other different probe composition of said array.