hnRNP, Sm, and U1 snRNP reactivities of autoantibodies in patients with SLE, RA, and MCTD (adapted from Smolen and Steiner21)
| Autoantibody | MCTD | RA | SLE |
|---|---|---|---|
| hn, heterogeneous nuclear; MCTD, mixed tissue connective disease; RA, rheumatoid arthritis; RNP, ribonuclear protein; SLE, systemic lupus erythematosus; Sm, Smith antigen; sn, small nuclear. | |||
| Anti-hnRNP | + | + | + |
| Anti-Sm | − | − | + |
| Anti-U1 snRNP | + | − | + |