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Hello Jan, I stored intact IgGs as an ammonium sulfate cut at 4C with a little azide for several months with no problems, but I can't recall ever trying long-term storage of the Fabs. Good luck. -Anna On Fri, Nov 6, 2009 at 8:52 AM, Jan Rash <[log in to unmask]> wrote: > Dear All, > > Does any body have any clue about the stability of monoclonal Fab fragments. > How long can they survive at 4 degree? What is an ideal temperature for > their storage; 4 degree, -20 or -80. > > thanks a lot > > Jan >