Cell Polarity in One-Cell C. elegans Embryos: Ensuring an Accurate and Precise Spatial Axis During Development -- Establishment and Maintenance of Cell Polarity in the C. elegans Intestine -- Apicobasal Polarity and Lumen Formation During Development -- Asymmetric Cell Division and Development of the Central Nervous System in Drosophila -- Polarity Control of Spindle Positioning in the C. elegans Embryo -- Par Proteins in Tumor Formation and Progression -- Cell Polarity: A Key Defence Mechanism Against Infection and Cancer Cell Invasion? Cell Polarity in Mammary Gland Morphogenesis and Breast Cancer -- Cellular Polarity and Pathogenicity.