Fig 1.

 The exposure regimes followed during the course of this investigation. Magnetic field exposure experiments were performed on human umbilical vein endothelial cells under the following conditions: (A) 700 μT, 24 hours; (B) 10 μT, 24 hours; (C) 700 μT, 60 minutes on, 30 minutes off, over 24 hours; (D) variable intensity, 10– 30 μT, changed every 30 minutes for 3 hours, left at the same intensity for 12 hours, then changed every 30 minutes for a further 9 hours