A family study of rheumatoid (ankylosing) spondylitis.
D001168:Arthritis; D001172:Arthritis, Rheumatoid / Q000235:genetics*; D006801:Humans; D013166:Spondylitis; D013167:Spondylitis, Ankylosing / Q000175:diagnosis*
ARTHRITIS, RHEUMATOID/genetics; SPONDYLITIS, ANKYLOSING/diagnosis