PRTN3 and rheumatoid arthritis: Using two different B-cell panels, we compared memory and plasma cell frequencies in one ACPA+ RA/PD (GT01; fresh biopsy) versus one non-RA/PD (GT03; fresh biopsy) patient, and memory, naïve and unswitched memory B cells in another ACPA+ RA/PD (GT10; fresh biopsy) versus non-RA/PD (GT09; fresh biopsy) patient.