To further verify the localization of B-cell clusters to the sarcoid granuloma, and to quantify potential differences in B-cell abundance in HLA-DRB1*03 positive and negative patients, additional analyses were performed involving the generation of digitally stitched fields of view, as well as hematoxylin and eosin (H&E) stains of granulomatous structures (Figure S2 in Supplementary Material). This evidence concerns the gene HLA-DRB1 and sarcoidosis.