TRIM21 and systemic lupus erythematosus: Between group I (n = 10) and group II (n = 18) of mothers with lupus, statistically different reactivities were found with Ro52 peptide 107–122 (88% versus 33%, P = 0.011), peptide 277–292 (100% versus 44%, P = 0.007) and peptide 365–382 (100% versus 61%, P = 0.039), and with Ro60 peptide 21–41 (75% versus 33%, P = 0.049) and peptide 304–324 (75% versus 33%, P = 0.049).