UAS sequences regulate expression of a fusion protein composed of the hh export signal sequence (codons 1-84), mCherry, amino acids VHG (the three most C-terminal amino acids of the hh signalling domain, the G residue of which is required for cholesteroylation by HhC) and the hh C-terminal domain (HhC, codons 258-472). Autocatalytic cleavage and cholesteroylation by HhC results in mCherry that is mono-lipidated with cholesterol at the C-terminal end.