SMAD6 and parasitic infectious disease: Atoh8 expression correlated with Hamp1 expression overall (see Fig. S1 in the supplemental material) and when analyses were limited to day 8 (P < 0.01, r = 0.78); gene expression of Smad6 and Smad7 on day 8 also correlated with Hamp1 (P < 0.01 for both, r = 0.73 and 0.75, respectively), although this correlation was not significant when including the earlier time points with lower parasitemia (Fig. S1).