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At weaning (day 22), blood lead levels were measured for 7–9 days from each exposure group. All controls (0 ppm) measured below the detection limit (1.3 μg/dl), the 2.1 ppm group averaged 4.1 μg/dl (± 1.3), the 16 ppm group averaged 25 μg/dl (± 7.3) and the 32 ppm group averaged 32 μg/dl (± 11.4).
