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The page below is a sample from the LabCE course Normal Peripheral Blood Cells (retired 2/12/2020). Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Null Cells

A third class of lymphocytes are called null cells. Null cells are not dependent on the thymus and they can attack certain types of specific cells without prior sensitization. This category includes killer (K) cells, which aid in the destruction of antibody-coated targets, and natural killer (NK) cells, which can lyse targeted cells.