EMSA--Biotin-labeled probes - How to keep unused probes (Sep/01/2008 )

Hi,

I've prepared a few sets of biotin-labelled probes for EMSA. I'm wondering what's the proper way to store these probes if I want to use them in the future? And, how long can I store the probes for?

Thanks!

I have kept the dissoved primers in -20 nearly 2 year.And they all goes well when reused.