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Whereas optical 3D imaging approaches have experienced a formidable revolution, they have remained limited due to current incapacities in obtaining specific labelling within large tissue volumes. We present a simple approach enabling reconstruction of antibody labeled cells within entire human organs with preserved organ context. We demonstrate the utility of the approach by providing volumetric data and 3D distribution of hundreds of thousands of islets of Langerhans within the human pancreas. By assessments of pancreata from non-diabetic and type 2 diabetic individuals, we display previously unrecognized features of the human islet mass distribution and pathology. As such, this method may contribute not only in unraveling new information of the pancreatic anatomy\/pathophysiology, but it may be translated to essentially any antibody marker or organ system.<\/jats:p>","DOI":"10.1038\/s42003-021-02589-x","type":"journal-article","created":{"date-parts":[[2021,9,10]],"date-time":"2021-09-10T10:02:45Z","timestamp":1631268165000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["3D imaging of human organs with micrometer resolution - applied to the endocrine pancreas"],"prefix":"10.1038","volume":"4","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0712-8256","authenticated-orcid":false,"given":"Max","family":"Hahn","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9401-6844","authenticated-orcid":false,"given":"Christoffer","family":"Nord","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria","family":"Eriksson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Federico","family":"Morini","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tomas","family":"Alanentalo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Olle","family":"Korsgren","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5923-8572","authenticated-orcid":false,"given":"Ulf","family":"Ahlgren","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,9,10]]},"reference":[{"key":"2589_CR1","doi-asserted-by":"publisher","first-page":"541","DOI":"10.1126\/science.1068206","volume":"296","author":"J Sharpe","year":"2002","unstructured":"Sharpe, J. et al. 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