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(a) a-(D1)-AuNP – 30 nm c-AuNP assemblies at a ratio of 1:1 (upper) and 10:1 (lower). (b) Hetero-assembly of 20 nm and 13 nm a-(D1)-AuNP. (c) Homo – assembly of a-(D1)-AuNP using a linker strand D3. Scale bar = 100 nm; (insets) 25 nm.