Fig. 1.

The effects of Cd and Cu on the frequency of early blast cells in head kidney hematopoietic tissue of common carp (arithmetic mean ± s.e., *different from the value before metal exposure (time 0), p ≤ 0.05, U Mann–Whitney test). Cd-s, Cu-s and Cd-l, Cu-l—groups subjected to short- or long-term exposures, respectively