its been resuspended in hyb buffer and stored at -20 for about a week so far. Li Chi Ho <lichiho at china.com> wrote in message news:8qkvm2$9ug$1 at justice.csc.cuhk.edu.hk... > Jen > > how long you have kept it? > if you stored it in -70C, it could be stored for at least half year. > > Ho > >