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Polarized epithelia define boundaries, spaces, and cavities within organisms. Cavitation, a process by which multicellular hollow balls or tubes are produced, is typically associated with the formation of organized epithelia. In order for these epithelial layers to form, cells must ultimately establish a distinct apical-basal polarity. Atypical PKCs have been proposed to be required for apical-basal...
An early event in skeletal joint development is the specification of articular chondrocytes at the joint surface. Articular chondrocytes are distinct in producing lower levels of cartilage matrix and not being replaced by bone, yet how they acquire these properties remains poorly understood. Here, we show that two members of the Iroquois transcriptional repressor family, Irx7 and Irx5a, function to...
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