Different transcriptional profiles of mitochondrial fission markers in the whole adrenal gland, adrenal cortex, and medulla tissues after one, two, and ten times repeated psychophysical stress of the entire organism. Whole adrenal gland tissue (A), as well as the adrenal cortex (B) and medulla (C) tissues, were isolated from undisturbed rats, as well as acutely (1 × IMO) and repeatedly (2 × IMO and 10 × IMO) stressed rats. Tissue was further used for RNA isolation followed by an analysis of the transcriptional profile of mitochondrial fission markers. The data bars represent mean ± SEM values of two independent, in vivo experiments (number in brackets above the bars represents number of analyzed animals). Statistical significance was set at level of p < 0.05: * vs. control group and # vs. 1 × IMO group.