natural killer ( nk ) activity against k 562 target cells was studied in 60 patients with definite or classic rheumatoid arthritis ( ra ) , grouped by medication into 1 ) controls not in remission-inducing therapy , 2 ) patients treated with penicillamine , and 3 ) patients treated with azathioprine .
C0003873
rheumatoid arthritis
C0004482
azathioprine