LTA and acute lymphoblastic leukemia: Although prior studies have also shown that IL7R signaling can promote lymphotoxin α1β2 expression in lymphoid tissue inducer cells (Yoshida et al., 2002), in ALL cells IL7R signaling was not sufficient for upregulating surface LTα even at high IL7 concentrations, even though it promoted IL7Ra internalization (Figure 5—figure supplement 2A and B).