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Secreted frizzled related proteins (Sfrps) are thought to bind and regulate Wnt activity through a cysteine rich domain that is highly similar to that of Frizzled receptors. To investigate possible roles for Sfrps in chick development, we have isolated partial cDNAs encoding Sfrp-1 and Sfrp-2 and have thoroughly characterized the expression patterns of both genes. Both sfrp-1 and sfrp-2 are expressed...
The Wnt family of secreted proteins has been shown to have multiple roles in embryonic development. Wnt signals are thought to be propagated by binding to the cysteine-rich extracellular domain (CRD) of Frizzled, a seven-transmembrane-domain cell surface receptor. Secreted Frizzled-related proteins (generally denoted Frzb or Sfrp) possess a domain with a high degree of sequence identity and structural...
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