Figure 7. Pearson correlation heat maps for individual CpGs in the pituitary gland (A) the adrenal gland (B), and for the sum of methylation between all tissues (C) after exposure to chronic stress. The sum of methylation levels for individual animal in (filled circles, controls; empty circles, restrain stress; triangles, psychosocial stress) (D) Pearson correlation coefficients (panels A−C) are expressed by color [0 (blue) to 1 (yellow)]. *p < 0.01, ◊p < 0.01.