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Abstract
Fragile X syndrome is the most common inherited form of intellectual disability and results from a loss of function of the translational repressor FMRP. In this issue of Science Signaling, Kashima et al. find that FMRP binds to and represses a specific isoform of BMPR2, a type II bone morphogenetic protein (BMP) receptor. Reducing signaling through this BMP pathway reverses neuroanatomical defects observed in fragile X models.