Investigations into sex dimorphism during nuclear interphase of the Argasid tick, Ornithodoros savignyi (Audouin, 1827)

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I. Sex dimorphism, in agreement with the normal karyotype, was shown to exist in interphase nuclei of the argasid tick Ornithodoros savignyi. 2. Sex-chromatin bodies were suitably demonstrated only in nuclei of the rectal sac. Other tissues proved to be completely unsuitable. 3. An adapted method, giving excellent differential staining of the sex-chromatin bodies, is described.