cDNA expression libraries

[berg]

Hi there, I have a question.

Does somebody have a WORKING  protocol for mammalian expression cloning of
cDNA libraries into COS or other mammalian cells?

if you do, which vector and which COS (or other cellsystem) did you use and
what was the result?

Or maybe can you direct me to a company which sell kits for this kind of
experiments?

thanxs

jeroen