The process of horizontal gene transfer causes the appearance of natural genetically modified organisms. At the moment, it is known that over 7% of dicotyledonous plant species are naturally transgenic, i.e. nGMO [1]. These plants contain the genes of agrobacteria, which are integrated in the nuclear genome during infection. In some species of naturally transgenic plants, agrobacterial genes have been preserved for millions of years of evolution. Among these genes, genes encoding octopine/vitopine synthase (ocs/vis) can be distinguished [2].
 The study of homologues of octopin/vitopin synthase genes in naturally transgenic plants: their structures and diversity, products of encoded enzymes will allow us to establish the functions and evolutionary role of homologues in nGMO. Currently, bioinformatic and genetic engineering methods are used to solve these problems.
 ocs\vis-like were found in 7 species: Albizia julibrissin Durazz., Cenostigma pyramidale (Tul.) Gagnon G.P.Lewis, Paulownia fortunei (Seem.) Hemsl., Pterocarya stenoptera C.DC., Rehmannia glutinosa Steud., Santalum album L., Viscum album L. In total twenty one ocs/vis sequences are known in 17 nGMO species. Twe
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