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1

Immunofluorescence Staining of Cellular Markers

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Immunofluorescence staining was performed using standard procedures7 (link),71 . Primary antibodies used were mouse anti-Fas III (1:200, DSHB, 7G10), anti-HA (1:200; Sigma-Aldrich H3663), anti-PCNA (1:200; Santa Cruz sc-56), anti-GFP (1:1,000; Abcam ab 13970), anti-mKO (1:200; MBL PM051M), anti-mCherry (1:1000; Invitrogen M11217), anti-H3K27me3 (1:200; Millipore 07–449), anti-H4K20me2/3 (1:400; Abcam ab7817), anti-ssDNA (1:100, DSHB) and anti-BrdU (1:200; Abcam ab6326). BrdU analogue was Invitrogen B23151 5-bromo-2´-deoxyuridine (BrdU). Secondary antibodies were the Alexa Fluor-conjugated series (1:1000; Molecular Probes). Confocal images for immunostained fixed sample were taken using Zeiss LSM 700 Multiphoton confocal microscope with 63x or 100x oil immersion objectives and processed using Adobe Photoshop software.
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2

Immunofluorescence Staining of Cellular Markers

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Immunofluorescence staining was performed using standard procedures7 (link),71 . Primary antibodies used were mouse anti-Fas III (1:200, DSHB, 7G10), anti-HA (1:200; Sigma-Aldrich H3663), anti-PCNA (1:200; Santa Cruz sc-56), anti-GFP (1:1,000; Abcam ab 13970), anti-mKO (1:200; MBL PM051M), anti-mCherry (1:1000; Invitrogen M11217), anti-H3K27me3 (1:200; Millipore 07–449), anti-H4K20me2/3 (1:400; Abcam ab7817), anti-ssDNA (1:100, DSHB) and anti-BrdU (1:200; Abcam ab6326). BrdU analogue was Invitrogen B23151 5-bromo-2´-deoxyuridine (BrdU). Secondary antibodies were the Alexa Fluor-conjugated series (1:1000; Molecular Probes). Confocal images for immunostained fixed sample were taken using Zeiss LSM 700 Multiphoton confocal microscope with 63x or 100x oil immersion objectives and processed using Adobe Photoshop software.
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3

Western Blot Analysis of Phospho-H2A and Cell Cycle Markers

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Cells in supplemented EMM were collected and whole-cell protein extract was prepared by vortexing acid-washed glass beads in 20% trichloroacetic acid (TCA) and washing beads with 5% TCA. Lysates were boiled for 5 min in Laemmli Sample buffer (4% SDS, 60 mM Tris-HCl, pH 6.8, 5% glycerol, 5% 2-mercaptoethanol, 0.01% bromophenol blue) and analyzed by SDS-PAGE. Primary antibodies used were as follows: anti-phospho-H2A (Abcam ab17353; 1:1,000), anti-H2A (Cell Signaling 3636S; 1:1,000; re-probed after phospho-H2A), anti-GFP (Abcam ab291; 1:1,000), anti-myc (Abcam ab9106; 1:1,000) anti-PCNA (Santa Cruz sc-56; 1:1,000), and anti-cdc2 (Abcam ab5467; 1:1,000). After secondary antibody (Alexa Flour 488 or 647; 1:6,000) incubation, blots were developed using Amersham Typhoon biomolecular imager. Intensity of bands were quantified with ImageJ.
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