Plant virus promoters

[williams at bscr.uga.edu]

Are plant viral promoters expressed in mammalian cells? The CaMV 35S promoter
is the prototypical strong "constitutive" promoter for expression in plants
, and I believe that the SV40 "t" promoter serves a similar role for 
heterologous expression in mammalian cells (???), but has anyone used theser 
promoters across the kingdoms?  Also, can one expect all/most viral promoters 
to be expressed at some, albeit low, level in heterologous eukaryotes?

Any feedback or references on the subject would be appreciated. Thanks.
	WILLIAMS at BSCR.UGA.EDU