Figure 1: (a) Time course of the control and treated rats’ weight gain in the 3 weeks oral + 3 weeks intratracheal and the 6 weeks oral treatment. Mean ± SD, . Significance marking omitted for clarity; for this, see Table 2. (b) Relationship of summed Mn dose (abscissa) and daily weight gain (ordinate) of individual rats belonging to the treatment groups given in the insert. Daily weight gain was calculated by dividing total weight gain with the length of treatment.