SUMILON Companion Plate for 24 Well Cell Culture Inserts, Pkg of 12Background & Plate Description Permeable membrane cell culture inserts are normally used to grow cells to evaluate cellular functions, such as barrier formation, permeability, cell migration, and angiogenesis. During the maintenance of these cultures on cell culture insert plates, the media needs to be changed with fresh media and samples may need collected from apical (top of the insert) and basolateral (bottom of the insert) sides of the cell