This paper reports the presence of solitary cilia in endometrial fibroblasts and presents evidence indicating that ciliogenesis in the rat endometrium may be hormonally controlled. Very few solitary cilia are present in endometrial fibroblasts during oestrus and after the administration of oestradiol. Solitary cilia in endometrial fibroblasts are most numerous during the quiescent phases of the oestrous cycle. Ovariectomy, ovariectomy-hypophysectomy and progesterone treatment do not alter the occurrence of this organelle in endometrial fibroblasts.
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