Abstract: A process for preparing information that identifies a compound as capable of perturbing the epithelium in a D. melanogaster comprising the steps of: i) obtaining a D. melanogaster which is genetically unmodified except that the D. melanogaster optionally comprises at least one nucleotide sequence encoding a reporter polypeptide operably linked to a promoter of an endogenous protein; ii) contacting the D. melanogaster with the compound; and iii) determining whether there is a difference between the epithelium of the D. melanogaster of ii) and the epithelium of a corresponding D. melanogaster not contacted with the compound, wherein the presence of a difference between the epithelium of the D. melanogaster contacted with the compound and the epithelium of a corresponding D. melanogaster not contacted with the compound identifies the compound as a compound that is capable of perturbing the epithelium in a D. melanogaster.