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https://s3.amazonaws.com/academia.edu.documents/46632881/ni158220160619-10667-uitduw.pdf?response-content-disposition=inline%3B%20filename%3DFunctions_of_natural_killer_cells.pdf&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=ASIATUSBJ6BACI7774XY%2F20200425%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200425T083326Z&X-Amz-Expires=3600&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEFwaCXVzLWVhc3QtMSJGMEQCIH%2F65hyVRQxFM%2BRNzmFZ7iLppMq8M9c2aNB%2FOOi7NdD4AiAE3j6FNA33IddJ9JgEFHuLrmXnhbkIHNu4Tp3y7%2BAZ%2Fiq9AwiF%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F8BEAAaDDI1MDMxODgxMTIwMCIMEx4XHINr6S0Jit5MKpEDAT8AgmNbeLc3q%2FsBH2V5sUTqxlsfXvPz%2BumdvO1nenNMJUGTWAcPLh9jrqO7F3y1NmNrAjhuGx1d3B11whir6oTzVpBe2L%2Bf%2FYZ%2FUk8oO8RVIF6qqp0HySoGzyEZyX1Mnk4%2BB9Zmrc8UZAmVY8Vbe3Sl3lAfVq8xrVtFH7ddNnul1CRAONJnx0ItmfH%2BjvsuYxBqbPXXDOOb21OQFmbj9tKlLIhzc%2BR7zUxCGDkojQFskt%2Fxr9VVYDmbE2my4dsR9ZFIqOUVbTEQZZQPIP3Qhh159MWdyGc80FU1i3CnJCq%2FaAkNu%2Bb9PBHopecZp7CCnu82gIljxcv8uqH5ntHpvAxAFPjPAZClmHnC0Jx5F3x9GuUOUc0UDEDqc%2BFazAiHKyF%2F2sSQyut7xbYyyKYWInrcMA91JntyzBfhGdvb7I4m2rDiyOmd0VHyQyg8HLTeFo9CWAaXTpfzmf1T%2FP73xlhuO7Trac1q%2FwbzNob6lxdKbHmePXo2JMb7VTi0hA%2FAPDtL%2Fxfp9khFXMrMw2089Zwwl9uO9QU67AHJPty8EKz2CaYUaJdZhb6S2uy%2FL1AE9xwpuJZzHf9NWzcDGGFT33mlgfuKBekqTYQktdOkeFdk2l8DzoGOmYhIfvC3a1VXvk9H9QpKN6J0t6h8x%2FmpE14vWqYH62T6X4HQjhH%2F%2FgPAZrsZrHEfIeF73iPYKmpDr9jedKuKP4qhDpcQCsjAqM6mVRwoGdBOzLGhEHhzeLAajgtGUTUQ3sBw2Od%2FlPrTsnDzTsq5kThKWa0kfM6QbiBy9MD%2BkTCoHgRiX%2FnUB27gXbiGPMR%2B%2BeKa%2FHQPdS4xK8mOmxQlKOv2xj1ywziqlEpSaku8zg%3D%3D&X-Amz-SignedHeaders=host&X-Amz-Signature=98a4c07762484fb2d2e1d23df46fe9eddc32e16a973806dbec3a9ef33ee3b84b