[On the problem of the nature of the rheumatoid factor].
D001168:Arthritis; D001172:Arthritis, Rheumatoid / Q000097:blood*; D006801:Humans; D007159:Immunologic Tests; D012217:Rheumatoid Factor; D005719:gamma-Globulins
D005719:gamma-Globulins; D012217:Rheumatoid Factor
ARTHRITIS, RHEUMATOID/blood; GAMMA GLOBULIN