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Asgard archaea, which are considered the closest known prokaryotic relatives of eukaryotes, potentially encode these functions within their large set of \u2018eukaryotic signature proteins\u2019\n                    <jats:sup>3\u20136<\/jats:sup>\n                    . The few cultivated members show a complex cell morphology, consisting of a central cell body from which several protrusions extend, filled with an actin-based cytoskeleton\n                    <jats:sup>7,8<\/jats:sup>\n                    . Here, live-cell microscopy of two organisms of the Lokiarchaea and Hodarchaea lineages\n                    <jats:sup>7,9<\/jats:sup>\n                    showed that they dynamically and greatly change their cell shape on a minute time scale and grow and retract their extensive protrusions with a speed of 1.5\u20134.8\u2009\u00b5m\u2009min\n                    <jats:sup>\u22121<\/jats:sup>\n                    , respectively. After adhering to a glass surface, cells use their protrusions to undergo active crawling motion. In the presence of selected actin inhibitors, however, the observed dynamics were arrested, suggesting a central role of actin in these processes. The observed cellular plasticity and motility are unique features among prokaryotes and might have been crucial for the emergence of the first eukaryotic cells that are thought to have formed through the association of a member of the Asgard archaea and an \u03b1-proteobacterium, the ancestor of mitochondria.\n                  <\/jats:p>","DOI":"10.1038\/s41586-026-11063-9","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T15:03:16Z","timestamp":1790780596000},"page":"1218-1225","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Dynamic protrusions mediate crawling motility in Asgard archaea"],"prefix":"10.1038","volume":"658","author":[{"given":"Philipp","family":"Radler","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7128-3461","authenticated-orcid":false,"given":"Tobias","family":"Viehboeck","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhen-Hao","family":"Luo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8961-4847","authenticated-orcid":false,"given":"Nevena","family":"Masla\u0107","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katharina","family":"Schmidt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9843-3522","authenticated-orcid":false,"given":"Robert","family":"Hauschild","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0046-9306","authenticated-orcid":false,"given":"Masaru K.","family":"Nobu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1441-7152","authenticated-orcid":false,"given":"Silvia","family":"Bulgheresi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0352-9474","authenticated-orcid":false,"given":"Theresia E. 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