I have seen no evidence that this is possible - but I'm sure someone
has tried by now. My particular interest in in stably infecting
human CD34+ cells with a retroviral vector bearing GFP as a marker.
I'd also be interested in any more news about artificial GFP mutants
at SER65 which are supposed to be up to 6x brighter than wt (Nature
373, 665).
Richard Darley
Dept Haematology
UWCM
Cardiff, UK