Letter: Comments on reported observations of cells spreading on the upper surfaces of other cells in culture.
D000818:Animals; D002448:Cell Adhesion; D002465:Cell Movement; D002478:Cells, Cultured / Q000502:physiology*; D003094:Collagen; D004847:Epithelial Cells; D005347:Fibroblasts; D008321:Mammary Glands, Animal; D051379:Mice; D013499:Surface Properties
D003094:Collagen