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K-cell activity in aplastic anaemia.

K-cell activity was measured by specific cytotoxicity and cytotoxic capacity in 29 patients with aplastic anaemia. 9 patients had a reduction of the specific cytotoxicity and 12 had a decreased cytotoxic capacity. The decreased cytotoxic capacity correlates with the severity of aplastic anaemia. Some of the possible causes of the reduction of this activity were investigated.