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The Incidence of Mammary Tumors in Germ-free C3H Mice¹

The Germ-free Laboratory, Department of Surgery, University of Utah College of Medicine, Salt Lake City, Utah 84112

Germ-free C3H/Pi mice were compared with their conventional counterparts (C3Hf/Pi) with regard to the development of mammary tumors. The incidence of mammary tumors in both populations was virtually identical.

¹ Supported by USPHS Grant CA 05771 from the National Cancer Institute, and Contract PH43-64-925 from the Cancer Chemotherapy National Service Center, NIH.

Received 8/ 4/66. Accepted 11/ 3/66.