| http://www.w3.org/ns/prov#value | - The receptors of hematopoietic and other growth factors can be grouped into two distinct families of related proteins: (1) tyrosine kinase receptors, including those for epidermal growth factor, M-CSF (Sherr, Blood 75:1, 1990) and SCF (Yarden et al., EMBO J. 6:3341, 1987): and (2) hematopoietic receptors, not containing a tyrosine kinase domain, but exhibiting obvious homology in their extracellul
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