In article <4kj66e$1oq at mailhost.zeneca.co.uk>,
john brennand <john.brennand at gbapr.zeneca.com> wrote:
>Are you sure that your plasmids are "compatible" and able to exist in
>the same cell ?
>>I don't really know the story on this one but there is a lot of
>literature out there about plasmids belonging to compatability groups.
LOOK in Sambrook, it's in there in the first chapter.