FCRL4 and neoplasm: In sample-level scRNA-Seq correlations of tumours, FRC-like fibroblasts positively correlated with various B-cell subsets [including cycling B-cells, FCRL4 + B-cells and germinal centre (GC) B-cells], plasma cells, KIT + NK-cells (Fig. 3A), with high correlation with IgM expressing B/plasma cells.