[Immunology] cytokines in serum

daifu daifu daifu_2005 at yahoo.com
Wed Mar 15 01:57:08 EST 2006

I have collected blood from cattle and serum was kept at -20C to freez. Now may I investigate the IL-2 and IFN-gamma after this long period. How long this kind of cytokines persist in frozen serum (at -20C and -70C)
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