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(A-B) Structures of C225-HAuNS (A) and PG-Gd-NIR813 (B). (C) Absorbance of C225-HAuNS. Note peak at ~810 nm. (D) Fluorescence emission spectrum7 of PG-Gd-NIR813 (excitation wave- length at 776 nm). The maximum fluorescence intensity was at ~813 nm.