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Figure 3. Implantation sites on days 4 and 5 of pregnancy as detected by intravenous injection of Chicago blue B dye injection.
Blue bands along the uterine horn of hamsters (A, day 4 1200 h; B, day 4 1800 h; C, day 5 0900 h) and mice (D, day 5, 0800 h) are indicators of implantation sites.