Yeast competent frozen

[Manuel G. CLAROS]

I have heard something about freezing and storing competent yeast cells.

Is it true?
Is there a method described? where?

Can I hope that someone will help? ;-)

Thanks
-- 
Manuel G. CLAROS     -. .-.   .-. .-.   .   -> claros at obelix.cica.es <-
Biologia Molecular   ||X|||\ /|||X|||\ /|   No quiero cambiar, no puedo,
Facultad Ciencias    |/ \|||X|||/ \|||X||   no quiero ser una frase mas.
E-29071 Malaga       '   `-' `-'   `-' `-         (Esclarecidos)