Fig. 4

Iron clearance in long- and short-term measurements. Absolute iron content per cell was analyzed using MP-AES. a Iron content in VFFs was quantified daily for 4 days. Time point 0 represents the iron load 24 h after the addition of SPIONs. ***p ≤ 0.0001 (details in Table 1). (b) After 40 days, iron content in VFFs reached same level as the control group. *p ≤ 0.05, **p ≤ 0.001, ***p ≤ 0.0001 (details in Table 2)