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Endocytosis (continued)

Pinocytosis In this case, the vesicles are small and the cell eats soluble molecules that would otherwise have difficulty penetrating the membrane. The pinocytic mechanism involves energy expenditure and is very selective for certain substances such as salts, amino acids and certain proteins, all of them water soluble.
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42.1D: Natural Killer Cells - Biology

Natural killer cells are part of the innate immune response that recognize abnormal MHC I molecules on infected/tumor cells and kill them.Learning ObjectivesDescribe the role of natural killer cells in the immune responseKey PointsNatural killer (NK) cells are lymphocytes (a subclass of white blood cells) that recognize infected or tumorogenic cells and kill them.
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