Assertion: lymphoblast's cell | /r/CapableOf | attack virus-infected cells
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text: There are three major types of lymphocytes: B lymphocytes, which produce antibodies to help combat infections T lymphocytes, which have several functions including assisting B lymphocytes to make antibodies Natural killer (NK) cells, which can attack virus-infected cells or tumour cells ALL develops from early-stage lymphocytes in various stages of development.