Hi Amin

it depends on what you're searching for. as it it is said in the link, "Unlike oligo arrays, which can only identify copy number changes, SNP chromosomal microarrays can identify copy neutral changes, such as uniparental disomy (UPD), and loss of heterozygosity."

all the best

fred

There are two types of microarrays: Comparative Genomic Hybridization arrays and SNP arrays.

CGH-based arrays (aCGH) measure the quantity of genomic DNA in a patient's sample and compares it with the genomic DNA in a normal control sample. The assay works by enzymatically cutting the patient and control DNA samples into fragments and then labeling each one in a different fluorescent color.

Single nucleotide polymorphism (SNP) arrays use DNA probes that derive from regions in the genome that show differences between individuals at a single base pair site.