(A) Representative mice subcutaneously injected with Hela-tet-on (upper panel), LZTFL1-32 (lower panel) cells and fed without (left panel) and with Dox (right panel) at the end of 5 weeks after injection. Corresponding tumors are pictured in the inset. (B) Average tumor mass resulting from cells injected into the flank of nude mice. (n, number of mice for each clone ± SEM, p < 0.05, student t-test). (C) Western blot analysis of tumor lysates using anti Flag-antibody (upper panel, short exposure; lower panel, long exposure).