[1] EUROPEAN MOLEC BIOL LAB, D-69117 HEIDELBERG, GERMANY
[2] HARVARD UNIV, DEPT CELLULAR & DEV BIOL, CAMBRIDGE, MA 02138 USA
[3] FORTH, INST MOLEC BIOL & BIOTECHNOL, CRETE, GREECE
[4] UNIV NAPLES FEDERICO II, DIPARTIMENTO GENET BIOL GEN & MOLEC, NAPLES, ITALY
[5] UNIV PATRAS, DEPT BIOL, PATRAI, GREECE
[6] CTR DIS CONTROL & PREVENT, DIV PARASIT DIS, ATLANTA, GA 30341 USA