ninety-nine sera from patients with different rheumatic diseases ( systemic lupus erythematosus , rheumatoid arthritis , progressive systemic sclerosis , and mixed and unidifferentiated connective tissue disease ) were applied to a newly developed isoelectric focusing ( ief ) immunoblot system for the demonstration of antinuclear antibodies .
C0036421
progressive systemic sclerosis
C0009782
connective tissue disease