Dear Netters , Have you heard about "Leucine zipper" or "Bilateral hydrophobic zipper". Please , if yes send mi more information , where I can find out about it. Marek Tchorzewski E-mail <MICROB AT PLUMCS11> University of Maria Curie-Sklodowska Department of Molecular Biology Akademicka 19 St. 20-033 LUBLIN (POLAND)