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Neighbor-joining phylogenetic tree of HIV variants based on PR-RT sequence. The tree shows the phylogenetic relationships between HIV sequences obtained from 14 inmates (marked by a dot) and reference HIV sequences with a known genotype. The country of origin of non-Italian inmates is indicated. The abbreviations in capital letters before each number of the dotted sequences represent the city where the inmate resided. BS = Brescia, GE = Genoa, MO = Modena, SS = Sassari.
