[1] Univ Vienna, Inst Theoret Chem, A-1090 Vienna, Austria
[2] Univ Leipzig, Bioinformat Grp, Dept Comp Sci, D-04107 Leipzig, Germany
[3] Univ Leipzig, Interdisciplinary Ctr Bioinformat, D-04107 Leipzig, Germany
[4] Fraunhofer Inst Zelltherapie & Immunol Deutsch Pl, D-04103 Leipzig, Germany
[5] Santa Fe Inst, Santa Fe, NM 87501 USA