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A key driving force in epithelial morphogenesis is cell rearrangement, which results from the remodelling of cell-cell contacts. In epithelia, cell-cell contacts are connected via vertices, where 3 or more cells meet. It is unknown whether cell vertices play an active role in regulating cell rearrangement, however recent work from a number of model systems has suggested that cell vertices are important sites for sensing and regulating tissue tension and providing geometric cues for morphogenetic cell behaviours. I have used the Drosophila model system to investigate the behaviour and role of vertices in epithelial morphogenesis, using as an entry point a newly discovered marker of epithelial vertices, the Immunoglobulin-superfamily domain protein Sidekick. I have characterised the localisation of Sidekick tagged with YFP in a number of Drosophila epithelial tissues and found that in most epithelial tissues, Sidekick-YFP localises to vertices at the level of adherens junctions. 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