For completeness, we also evaluated the other 13 IBD stretches shared in at least one copy among all 5 RA cases and 1 ACPA-positive unaffected subject, and found one additional missense single-nucleotide variant (SNV) and 1 insertion-deletion (Indel) included in the IBD stretches (Table 1). This evidence concerns the gene PRTN3 and rheumatoid arthritis.