Cell fence assay is another convenient and automatic method to study cell migration, which offers distinct advantages such as keeping the culture sterile easily for long time experiments and permitting study of cell migration on a defined matrix. In the process of fence assay, cells are seeded into the inner area of removable fence (ring) which is placed on a standard cell culture dish. cell ring assay cellassay.creative-bioarray.com/services/cell-fence-ring-assay.htm