Can't freeze my comp cells!

[ChenHA]

Susanne Rohrer wrote:
> 
> As someone else stated, the Inoue Method is fine. What we watch out for
> is to add the DMSO very slowly, i.e. dropwise while stirring the cells,
> on ice, on a slow shaker. Then we just snap-freeze in LN2. Thawing them
> slowly is recommended as well.
>

Just a brief note:  Hanahan reported that oxidised DMSO
affects the competence of cells, however, Inoue also
reported oxidation of DMSO have no effect whatsoever.  So it
may behave differently for different methods? 
 
> Susanne