[1] MAX PLANCK GESELL,AG MOL & ZELLULARE BIOPHYS,D-07747 JENA,GERMANY
[2] MPI EXPT MED,D-37075 GOTTINGEN,GERMANY
[3] ZMNH,INST NEURALE SIGNALVERARBEITUNG,D-20246 HAMBURG,GERMANY
[4] INST NEUROBIOL,D-69120 HEIDELBERG,GERMANY
[5] UNIV DUNDEE,DEPT ANAT & PHYSIOL,DUNDEE DD1 4HN,SCOTLAND