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Large areas of oil contaminated soil are an urgent problem in oil producing regions, such as the Republic of Tatarstan (Russia). One of important factors of soil self-restoration is the presence of members able to decompose hydrocarbons in the microbial community. Different groups of genes are responsible for decomposing different hydrocarbon groups: for example, alkane monooxygenase gene and naphthalene dioxygenase gene are the predominant genes corresponding to first-step hydroxylases involved in the metabolism ...