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Posted: January 26th, 2012, 1:00am EST
I have been freezing cells in a freezing medium consisting 10% DMSO, 20% FBS and 70% RPMI or DMEM. The cells will be stored overnight at -80oC and then transfered to liquid N2 . We make our own freezing medium as indicated above. The problem comes when we want to use these cells after storage. All the cells are dead and there are no viable ones despite storage at the appropriate density and having been stored at greater than 90% viability. W...