NT5C1A and systemic lupus erythematosus: The large variation in the frequencies of anti-cN-1A in SLE and pSS reported in the aforementioned previous studies might be due to the different techniques that were used: western blotting and ELISA with the full-length recombinant protein produced in different host cells, and ELISA with three synthetic peptides [Table 3, reviewed in detail in Ref.