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Influence of short photoperiods on the ultrastructure of hamster Harderian glands

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A sexual dimorphism of the hamster Harderian gland at the ultrastructural level, has been reported. Castration of males and the administration of testosterone to females are known to alter the male type gland to the female type and vice versa. In this paper we present data that exposure to a short photoperiod (1L:23D) can induce similar structural alterations between the 4th and 10th week of exposure. Changes in the male included reduction in the number of tubular clusters and large vacuoles, while in the female the number of membrane formations decreased with an accompanying appearance of tubular clusters.

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Correspondence to Professor M. J. Nadakavukaren.

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Nadakavukaren, M.J., Lin, W.L. Influence of short photoperiods on the ultrastructure of hamster Harderian glands. Cell Tissue Res. 233, 209–213 (1983).

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Key words

  • Hamsters
  • Harderian glands
  • Short photoperiod
  • Sexual dimorphism
  • Electron microscopy