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In a retrospective study, data are collected that represent present and past status on variables. Generally speaking, the idea is to find out what past conditions helped produce a present condition.
Goblet Cells
Epithelial cells that secrete mucus to lubricate surfaces such as the inside of the intestinal and respiratory tracts.
Tight Junction
A tightly sealed point of contact between two cells, preventing the passage of substances between the cells.
Plasma Membranes
A pair of lipid layers that forms a barrier around the cell's cytoplasm, controlling the import and export of cellular materials.
Adhesion Belt
A protein complex located just below the tight junctions in epithelial cells, contributing to the formation of an adhesive junction that holds cells together.
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