U Alyagon1, N Barnea-Ygael1, L Carmi1, A Zangen2. 1. Ben-Gurion University, Department of Life Sciences and the Zlotowski Center for Neuroscience, Be'er-Sheva, Israel. 2. Ben-Gurion University, Department of Life Sciences and the Zlotowski Center for Neuroscience, Be'er-Sheva, Israel. Electronic address: azangen@bgu.ac.il.