Figure 4From: Possible role of membrane gamma-glutamyltransferase activity in the facilitation of transferrin-dependent and -independent iron uptake by cancer cells.Effects of modulation of membrane GGT activity on the uptake of 55Fe-nitrilotriacetate complex by GGT-rich U937 (A) and Me665/2/60 cells (B). Data shown are means ± SEM of 3–5 experiments. * Significantly different from control value, P < 0.05.Back to article page