Research article Open Access Published: 03 February 2022 Renée H. Fiechter1,2,3 na1, Janne W. Bolt1,2,3 na1, Marleen G. H. van de Sande1,2,3, Caroline J. Aalbers1,2,3, Robert B. M. Landewé1,2,3, Mario Maas4, Sander W. Tas1,2,3 na1 & Lisa G. M. van Baarsen1,2,3 na1 Arthritis Research & Therapy volume 24, Article number: 36 (2022) Cite this article Abstract Background Analyses of lymphoid organs are required to further elucidate the pathogenesis of inflammatory diseases like rheumatoid arthritis (RA).