Table 2.

Average tissue metal concentrations (± SEM) measured by inductively coupled plasma mass spectroscopy, expressed as µg metal/g tissue, in the frontal cortex of Mn-exposed and control animals

	Mn	Cu	Fe	Zn
Control	0.20 ± 0.02	3.40 ± 0.47	30.65 ± 4.80	11.97 ± 1.10
Mn-Treated	0.36 ± 0.05	4.70 ± 0.56	31.23 ±3.72	13.16 ± 1.46
p- value	0.04*	0.04*	0.93**	0.54**

^*p-values for the Mn and Cu measurements were derived using a one-tailed Student’s t-test;

^**p-values for Fe and Zn measurements were derived using a two-tailed Student’s t-test.