>>>1) Does anyone know if it is possible to perform ELISA on serum and CSF samples that were stored one year at -20?<<< For serum, in general probably yes, depending on the stability of what it is in the serum that you wish to measure. For CSF I'm less certain. >>>2) How long can one keep the samples at -80 to perform ELISA afterwards? <<< Again depending on what you are measuring, serum stored at -80 is often stable for 10 years or more. Kurt Bray
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