Assertion: lymphoblast's lymphocyte | /r/CapableOf | participate in null group
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text: is thatis (cytology|immunology) a type of white blood cell or leukocyte that is divided into two principal groups and a null group; b-lymphocytes, which produce antibodies in the humoral immune response, t-lymphocytes, which participate in the cell-mediated immune response and the null group, which contains natural killer cells, cytotoxic cells that participate in the innate immune response whileis (us|cytology|oncology) an immature lymphocyte; they proliferate uncontrollably in lymphoblastic leukemia.