CXCR5 and malaria: We, therefore, examined the signature genes associated with cluster 10 and found enrichment of the transcription factor TCF1 (gene name Tcf7, Table S2); this has been associated with circulating TFH cells in a mouse model of malaria (Lonnberg et al., 2017), but we found no significant enrichment for PD1, CXCR5, or BCL6 (Fig. S3 E).