Mutations in methyl-CpG-binding protein 2 (MECP2) underlie most cases of Rett Syndrome, a neurodevelopmental disorder with neurological and somatic impairments. In this issue of Immunity, Cronk et al. (2015) find that macrophages in MeCP2-deficient mice are abnormal in number, as well as in glucocorticoid, hypoxia, and inflammatory responses.
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