EN
DNA microarrays is a method used for the determination of gene expression level, detection of single nucleotide polymorphism (SNP) and quantification of the exact number of viral gene copies per one cell. The technique has a broad application in studies on tumorous diseases of humans and animals. Microarrays are also applied in studies of drug influence on the cell metabolism and the molecular silencing of genes. The main advantage of DNA and protein microarrays is the possibility to analyse a number of complex cellular processes in progress of a tumoral disease during a single run of analysis. In the case of a tumorous disease the microarray technique makes it possible to quickly identify the main genes responsible for the oncogenesis and to determine the type of the disease. In spite of a high costs of microarray production as well as the need to synthesize probes and substrates for specific analyses, microarrays become increasingly popular in numerous research laboratories.