In our hands, we detected unespecific GFP expression in the most-posterior intestinal cells which was prevented when using the gene-specific 3´-UTR.
This unespecific GFP expression in the intestine depends very much on the lenght of the promoter or promoter+gene insert you use. The longer usually the lower unspecific GFP signal
Hope it helps
Antonio Miranda Vizuete, PhD.
Centro Andaluz de Biología del Desarrollo (CABD-CSIC)
Dpto. de Fisiología, Anatomía y Biología Celular
Universidad Pablo de Olavide
Carretera de Utrera Km. 1
41013 Sevilla
ESPAÑA (SPAIN)