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Chordin is a bone morphogenetic protein (BMP) inhibitor that has been identified as a factor dorsalizing the Xenopus embryo. A novel secreted protein, CHL (for chordin-like), with significant homology to chordin, was isolated from mouse bone marrow stromal cells. Injection of CHL RNA into Xenopus embryos induced a secondary axis. Recombinant CHL protein inhibited the BMP4-dependent differentiation...
Agrin is a secreted glycoprotein with the ability to cluster cell surface molecules, including the nicotinic acetylcholine receptor (AchR) on muscle cells. Alternate splicing of agrin mRNA results in a family of agrin proteins which differ in their clustering potency. Neuronal-specific isoforms with the highest clustering activity play a role in clustering postsynaptic proteins at the neuromuscular...
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