helper plasmid - help! (Feb/12/2004 )

I don't know how to choose helper plasmid.Would u please give me some advice on which helper plasmid better and how I can get it?thirst for ur reply as soon as possible.

Hi,
please specify your helper plasmid.
For what kind of experiment do you want to use it?
Regards,
H.

helper plasmid for triparential mating,thank u