In <49iqjj$dlo at bubba.NMSU.Edu>, dkim at nmsu.edu (Daniel Kim) writes:
>I had an inexpensive method for slow freezing cells in DMSO. I placed
>the cryo-vials in the holes of a foam 15-ml centrifuge tube rack (e.g.
>orange rack) and covered with a second rack. Wrap the whole thing in a
>plastic bag and put into the -70 freezer overnight.
>>The next day, put the frozen cells in the liquid nitrogen.
I also use this method regularly. Nice and simple!