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Four distinct cDNAs for activin receptor designated as XSTK2, 3, 8 and 9 have been cloned from a Xenopus laevis cDNA library. The protein structures deduced from the cDNAs have shown that they all have a putative extracellular ligand-binding domain, a single transmembrane domain and cytoplasmic Ser/Thr kinase domain, except that XSTK2 is extremely similar to the XSTK3 gene but lacks a carboxyl-terminal...
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