An intestine-specific CG10116 enhancer fragment is fused upstream of a protein that encodes 10 copies of the Tag:V5 epitope embedded within an inactive, non-fluorescent version of GFP ('smGdP'). The open reading frame is tagged at the C-terminal end with Tag:NLS(tra). A mutated cbt 3'UTR, in which 3 nucleotides in the seed sequences of each of the two predicted mir-958 binding sites have been converted to complementary sequences, is present downstream of the coding sequence.