Fig. 2.

Comparison of the changes in mineral ratio composition: Zn/Cu and Zn/Fe in the serum of rats with mammary cancer against the control rats. Numbers 0–8 refer to the serum evaluated at 20 weeks of the animals’ age (decapitation time). DMBA 7,12-dimethyl-1,2-benz[a]anthracene. a statistically significant results of a comparison of the ratio of minerals in the serum of the DMBA+ and DMBA− groups of rats receiving the same diet (p < 0.05). b statistically significant results of a comparison of the ratio of minerals in the serum of the DMBA+ and DMBA− groups of rats receiving the same diet (p < 0.001). (n) test number