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These two morphologies are determined by depletion forces tuned by the concentration of poly(ethylene glycol) (PEG) in solution. At lower PEG concentrations (25\u201330\n                    <jats:sub>w\/v<\/jats:sub>\n                    %), the depletion forces between duplexes are relatively weak. Under these conditions, nucleation occurs only at lower temperatures after sufficient duplex DNA has formed, leading to predominantly longitudinal growth and the formation of elongated DNA fibers. Small\u2010angle X\u2010ray scattering (SAXS) revealed a single columnar hexagonal packing structure within these fibers. At higher PEG concentrations (35\u201340\n                    <jats:sub>w\/v<\/jats:sub>\n                    %), the depletion forces become stronger. Under these conditions, nucleation occurs even at elevated temperatures, where the amount of duplex is still limited, leading to the formation of tubular assemblies. SAXS measurements conducted on the tubular DNA assemblies revealed two separate hexagonal lattice constants, suggesting differences in packing density between the inner core and the outer framework. This work establishes a new direction in DNA\u2010based materials design, demonstrating that hierarchical liquid\u2010crystalline architectures can emerge from a single short DNA oligonucleotide simply by tuning molecular crowding conditions.\n                  <\/jats:p>","DOI":"10.1002\/anie.6741643","type":"journal-article","created":{"date-parts":[[2026,6,23]],"date-time":"2026-06-23T08:16:31Z","timestamp":1782202591000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Fibers and Double\u2010Layered Tubes Formed From a Single Self\u2010Complementary DNA Oligonucleotide"],"prefix":"10.1002","volume":"65","author":[{"given":"So","family":"Shirai","sequence":"first","affiliation":[{"name":"Department of Engineering Science Graduate School of Informatics and Engineering The University of Electro\u2010Communications  Chofu Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tetsunao","family":"Makino","sequence":"additional","affiliation":[{"name":"Department of Engineering Science Graduate School of Informatics and Engineering The University of Electro\u2010Communications  Chofu Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takashi","family":"Kajitani","sequence":"additional","affiliation":[{"name":"Core Facility Center Research Infrastructure Management Center Institute of Science Tokyo  Yokohama Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5819-802X","authenticated-orcid":false,"given":"Makiko","family":"Tanaka","sequence":"additional","affiliation":[{"name":"Department of Engineering Science Graduate School of Informatics and Engineering The University of Electro\u2010Communications  Chofu Tokyo 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