Fig. 4. NOS data for rats exposed for either 6 or 3 days to the treatments described under Fig. 1. N = 11–13 per group for the 6 day treatment; N = 9–12 per group for the 3 day treatment. Bars not labeled with the same letters are different (p < 0.05) signifying no differences between the PC, GA1 and GA2 groups, and higher activity than the CTL and CT + GA.