Figure 4. Tungsten-transformed clones grew tumors in vivo.

Twelve, six-week old female athymic nude mice were subcutaneously injected in the left flank with Na₂WO₄ transformed cells or the right flank with sporadic growth control cells. Each mouse is injected on one side with control and the other with tungsten-transformed cells to ensure the same biological environment. This figure shows a representative mouse that has formed tumors on the left side where they were injected with W-transformed cells, unlike the sporadic growth control cells.