The surface structures of DNA oligomers, pAAAAAAATTTTTTT, deposited on Cu(111) surface have been characterized at liquid nitrogen temperature using a scanning tunneling microscope. Four different types of adsorbed structures have been observed in DNA oligomers; (i) an isolated whole molecule, (ii) a shortened molecule, (iii) a cluster, and (iv) a double helix. The internal structures of the oligomers also have been resolved.

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