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3 protocols using prom1

1

Cryopreservation and Immunostaining of Skin

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For frozen sections the tissue was cryoproserved in Optimal Cutting Temperature (OCT) compound (VWR Chemicals, Lutterworth, UK #361603E) and sectioned at 5 μm thickness. Horizontal whole mounts were prepared as described previously (Driskell et al., 2012 (link), 2013 (link)). The following antibodies were used: Prom1 (1:50) (eBioscience, Hatfield, Ireland, UK, #14-1331-82), Keratin 14 (1:1000) (Covance, Cambridge, UK, #PRB-155P), Corin (1:100) (R&D systems, Minneapolis, MN, #AF2209), β-catenin (1:500) (Cell Signalling, Buckingham, UK, #8814S) and Ki67 (1:200) (Dako, Ely, UK, #M7249 clone TEC-3). All microscopy was performed on a Leica SP5 or Nikon A1 confocal microscope and images were analyzed using Image J (NIH).
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Immunofluorescence and Immunohistochemistry of Liver

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Livers were fixed in 4% paraformaldehyde (Polysciences, Inc., Warrington, PA) and embedded in paraffin or Tissue-Tek® Optimum Cutting Temperature (OCT) Sakura Finetek, Torrance, CA) for sectioning. Immunofluorescence (IF) staining signals for PROM1 (1:50 dilution, eBiosciences, San Diego, CA), CYTOKERATIN-19 (1:100 dilution, gift from JR Friedman, University of Pennsylvania, Philadelphia. PA), and LacZ (1:400, Bioss, Woburn, MA) were detected by secondary antibodies conjugated either with anti-mouse cyanine (Cy) 3, Cy5, anti-rat Cy3/Cy5, or anti-rabbit Cy3/Cy5 (1:200 dilution, Jackson ImmunoResearch Labs, West Grove, PA) (9 (link), 10 (link), 20 (link)). Images were then acquired by a Leica DM5500B IF microscope using Leica Suite Advanced Fluorescence (LAS AF) 6000 software (Leica Microsystems, Wetzlar, Germany). Immunohistochemistry was performed using 2.1 μg/mL anti-INTEGRIN-β6 (gift from Shelia Violette, Biogen, Inc). Bright-field images were captured using a Leica DM1000 (DFC290) transmitted light microscope (Leica Microsystems AG, Heerbrugg, Switzerland) with Leica Application Suite (version 2.7.1R1).
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3

Liver Organoid Characterization Protocol

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Liver tissues were embedded in OCT (Tissue‐Tek), and slices of 10 μm thickness were cut using a cryostat (Leica CM 1850). Organoids were removed from Matrigel® using Cell Recovery Solution (Corning) and then embedded in OCT and sliced, as described above. Tissue and organoid sections were fixed for 1 h in 4% paraformaldehyde at room temperature and stained using standard immunofluorescence techniques and commercially available antibodies (Yap1, Cell Signaling; Cldn3, GeneTex; Epcam, AbCAM; Prom1, E‐Bioscience; integrin A6, Millipore; Krt19, Dako; Hnf4α, Santa Cruz; Sox17, R&D; A6, gift from Valentina Factor, NIH). Nuclei were counterstained with DAPI, and images were acquired using a Zeiss 700 confocal microscope. Cell proliferation was assessed with the EdU Click‐it Kit (Life Technologies), and images were acquired with the organoids still embedded in Matrigel® using the confocal microscope. To assess glycogen storage, organoids were examined by the periodic acid–Schiff staining method (PAS, Sigma‐Aldrich).
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