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Truncated phylogeny (not according to scale) showing modes of sex determination and number of chromosomes in major lineages of vertebrates, with a particular emphasis on major families of lizards where modes of sex determination and sex chromosome systems are known and show high diversity. This figure includes only those lizard families where sex chromosomes have been identified cytogenetically. Adopted from [6,62,107,108,109,110,111,112,113,114,115,116,117] and references therein.
