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Stages in the differentiation of sex and NOR-bearing chromosomes among species and populations of Characidium. In (a) steps and idiogram representation of the NOR and W sequences rearrangements; (b) hypothesised relationship among species analysed. 1C. lauroi of the Ribeirão Grande population; 2C. lauroi of the Ubatuba population; 3C. gomesi of the Alambari population; 4C. gomesi of the Minhoca population and; 5C. gomesi of the Verde population.
