A NEW TESTICULAR FEMINIZATION MUTATION FOUND IN C57BL 6J MICE/

A new testicular feminization (Tfm) mutation found in the inbred strai n of mice, C57BL/6JJms, was separated from the original line and estab lished as a mutant strain. This line was named C57BL/6JJms-Tfm(Jms). T he process of discovery and breeding are described. Body weights were compared among male, normal virgin female and Tfm mice between 5 and 4 0 weeks of age. Tfm mice were generally intermediate in weight between male and virgin female mice. This result is different from that previ ously reported for the Tfm mouse strains and may be of interest in com parison between Tfm mice and their normal litter mates.