After Abuse, Changes in the Brain, by Benedict Carey.
Here's a snipet and the link to the entire article is below:
"The researchers found that the genes that code for these receptors were about 40 percent less active in people who had been abused as children than in those who had not. The scientists found the same striking differences between the abused group and the brains of 12 control subjects, who had not been abused and who died from causes other than suicide. “It is good evidence that the same systems are at work in humans that we have seen in other animals,” said Patrick McGowan, a postdoctoral fellow in Dr. Meaney’s lab at McGill and the lead author of the study."