because of the presence of a no 14 chromosome marker abnormality in eb virus-carrying cells from african burkitt 's lymphoma ( bl ) but not from other origins , and the association of eb virus with nasopharyngeal carcinoma ( npc ) as well as bl , both the malignant epithelial cells and the non-malignant lymphoid cells of npc have been investigated cytogenetically .
C1518174
malignant epithelial cells
C2931822
of npc