Mice with mutations in the Hoxb8 gene exhibit compulsive grooming behavior. Chen et al. (2010) now report that this behavior stems from Hoxb8 deficiency in microglia, a type of immune cell in the brain derived from bone marrow. These findings provide intriguing connections between immune dysfunction and neuropsychiatric disorders.
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Steven Hyman is Director of the Stanley Center for Psychiatric Research at the Broad Institute, where his goal is to drive the genetics of schizophrenia to the point of diminishing returns with respect to biological information, with bipolar disorder following closely behind.

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