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Fix cells in 2% formaldehyde in PBS/pH 7.4 for 15 min. at 20oC. 2% formaldehyde is made up fresh prior to use by dissolving the appropriate amount of EM grade paraformaldehyde (Prill form, from Electron Microscopy Sciences) in PBS and heating on a hot plate in the hood (setting of 5-6) until the aldehyde goes into solution. Keep the bottle cap loosened so that pressure does not build up. Cool down to 20oC and pH to 7......阅读全文

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