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In search of guiding principles involved in the branching of epithelial tubes in the developing kidney, we analyzed branching of the ureteric bud (UB) in whole kidney culture as well as in isolated UB culture independent of mesenchyme but in the presence of mesenchymally derived soluble factors. Microinjection of the UB lumen (both in the isolated UB and in the whole kidney) with fluorescently labeled...
Glycosaminoglycans in the form of heparan sulfate proteoglycans (HSPG) and chondroitin sulfate proteoglycans (CSPG) are required for normal kidney organogenesis. The specific roles of HSPGs and CSPGs on ureteric bud (UB) branching morphogenesis are unclear, and past reports have obtained differing results. Here we employ in vitro systems, including isolated UB culture, to clarify the roles of HSPGs...
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