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THE POSITION AND SPACING OF IMPLANTATION SITES IN THE UTERUS OF THE RAT DURING EARLY PREGNANCY

Summary.: A study has been made of the distribution and spacing of implantation sites in the uterus of the rat at the 5th day of pregnancy. It has been shown that, whereas the implantation sites along the horns are distributed in an entirely random manner, the distances between the sites are significantly non-random. These results are similar to those previously described for the rabbit and the mouse, and rule out the possibility of predicting a site of incipient implantation in the uterus of the rat.