CXCR5 and 22q11.2 deletion syndrome: PD1 expression further decreases later in life on cTFHs (linear regression, p = 0.04, R2 = 0.37) (Figure 4B), but not CXCR5− memory CD4+ T cells (Figure 4C) and CD4− T cells (Figure 4D) in DiGeorge syndrome.