1. Department of Life Sciences, Ben-Gurion University of the Negev, P.O. Box 653, Be'er-Sheva 84105, Israel; Microalgal Biotechnology Laboratory, Blaustein Institute for Desert Research, Ben-Gurion University at Sede-Boker, Sede-Boker 84990, Israel; and Department of Biochemistry, Tel-Aviv University, Tel-Aviv 69978, Israel