Of the strong false positive Abs (n = 7), 5 were MSAs (n = 1 for each of anti-EJ, anti-Mi2A, anti-SAE1, anti-SRP, anti-PL12), and 2 were MAAs (anti-Ku in a patient with resolved undifferentiated connective tissue disease and anti-PM-SCL75 in a patient with systemic lupus erythematosus). Here, UCN2 is linked to systemic lupus erythematosus.