Table 1.

Cell surface makers commonly used to define T follicular helper (Tfh) subsets in lymphoid organs.

	Humans		Mice
	Germinal centers (GCs) Tfh	Pre Tfh	GC Tfh	Pre Tfh
CXCR5	++	+	++	+
PD-1	++	+	++	+
Inducible co-stimulator	++	+	+	+
CD127	−	+	−	+
CCR7	−	− ~ ±	−	− ~ ±