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Background:Motile cilia in the “organ of asymmetry” create directional fluid flows that are vital for left–right (LR) asymmetric patterning of vertebrate embryos. Organ function often depends on tightly regulated organ size control, but the role of organ of asymmetry size in LR patterning has remained unknown. Observations of the organ of asymmetry in the zebrafish, called Kupffer's vesicle (KV),...
Loss of fragile X mental retardation protein FMR1 is the most common genetic cause of mental deficiency in man. We find that both FMR1 and the related FXR1 serve as direct binding partners for the Cdc42 effector PAK1. This involves an 11 residue segment in the PAK1 autoinhibitory domain that is exposed upon kinase activation and binds the FXR1 KH2 domain. Active PAK1 can phosphorylate FXR1 at Ser420;...
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