Abstract
The guinea-pig differs from other rodents in that the ovary of the post-natal animal contains two distinct populations of oocyte at diplotene. A `large' oocyte, comparable to that of other mammals, is found in some primordial follicles; in others a second, `contracted', type occurs. As the animal ages the contracted cell predominates. The radiosensitivity of these two cell-types has been investigated.

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