Cell packing density of CB-IR neurons in the occipital cortex (Brodmann's area 17) of control, MDD suicide (MDDs) and MDD non suicide (MDD ns). Values for the individual subjects (circles) and mean values (horizontal lines) are presented. Note that the mean values for CB-IR neurons density are comparable between MDD suicide and MDD non suicides (unpaired t-test, t=0.048, df=8, p= 0.96; Mann Whitney test, Z=0.0, p=1).