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(A) Absorption spectra of SE-HPLC-purified ICG-sOSu-panitumumab (1, 2, and 3) from 600 to 900 nm. (B) Competition radioimmunoassay of SE-HPLC-purified ICG-sOSu-panitumumab (1, 2, and 3) with 125I-panitumumab. ICG-sOSu-HuM195 and HuM195 served as negative controls while unmodified panitumumab served as a positive control.
