Schäfer W
Z Naturforsch C Biosci. 1979 Mar-Apr;34(3-4):306-9.
The highly inbred STU mouse strain (up to 100 inbred generations) was developed from a German white mouse colony. Its properties are described with special emphasis on the occurrence of tumors, occurrence of C-type oncornaviruses and on its immunological reactivity. The predominant tumor is a fibrosarcoma (approximately 23% incidence).