Fig. 7. JunB suppresses v-ras- and v-rc-induced tumour growth. (A) Phase-contrast photographs of WT and jB-Tg 3T3 fibroblasts infected with empty-neo or v-ras-expressing retroviruses. (B) Focus formation assay 2 weeks after infection with empty-neo or v-ras and v-src-expressing retroviruses. (C) v-ras-infected cells were injected subcutaneously into nude mice and the individual tumours were dissected and weighed after 2 weeks. One representative tumour of each genotype is shown in the upper part and the weight of each tumour is depicted in the lower part.