Double expression

[Heather L. Wiegand]

I am looking into mammalian double label expression experiments with
both the blue and green flourescent protein systems.  I know there are
vectors available with increased fluorescence for the GFP but I am concerned
as to whether I will be able to visualize both signals or if I will have 
problems with the GFP masking the BFP.  Has anyone been successful with
this and is there a good dual band pass filter for this?