| http://www.w3.org/ns/prov#value | - east 109 M???1, such as at least 1012 M???1 and/or with an affinity less than 500 pM, preferably less than 200 nM, more preferably less than 10 nM, such as less than 500 pM. The affinity of a derivative of a Nanobody of the invention against EGFR or IGF-IR, respectively, can be determined in a manner known per se, for example using the assay described herein.As mentioned above, the invention also
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