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Gene names are color coded to correspond to signal color. A) In nuclei with only one allele active for both genes the signals co-locate in both sexes. B) Nuclei from the homogametic sex in which both genes are 2Z/2X-active. C) Nuclei from the homogametic sex in which the active Z/X expresses both genes and the other (inactivatable) Z/X expresses only one gene.
