[1] Univ Med Gottingen, Mol Physiol Herz & Kreislaufphysiol, Gottingen, Germany
[2] Univ Saarland, Biophys, Ctr Integrat Physiol & Mol Med, Homburg, Germany
[3] Wistar Inst Anat & Biol, Melanoma Res Ctr, 3601 Spruce St, Philadelphia, PA 19104 USA
[4] Univ Med Gottingen, Transfus Med, Gottingen, Germany