Researchers in South Korea led by Jeong Hee Hong at Gachon University, Incheon, and Dong Min Shin at Yonsei University, Seoul, identified the protein NBCn1 in fibroblast-like synoviocytes (FLS) with response to the synovial fluid of patients’ joints affected by RA. Here, SLC4A7 is linked to rheumatoid arthritis.