The prepared solution [0, 50 (25 μg/500 μL) and
100 ppm (50 μg/500 μL) of Pb; and 0, 50 (25 μg/500 μL) and 80 ppm (40 μg/500 μL) of Hg] was injected into each yolk sac of 6-ED
chick embryos. On 20-ED, the collected chick embryo brains were digested for Atomic Absorption Spectrometry analysis