| http://www.w3.org/ns/prov#value | - Further, other examples of ligand include erythropoietin. [0032] In the fifth aspect of the present invention, as the fibroblast growth factor to be used as the retrovirus binding domain, there are fibroblast growth factors selected from, for example, a fibroblast growth factor represented by SEQ. ID No. 3 of the Sequence Listing, functional equivalents of the factor and polypeptides containing th
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