Comparative functional analysis of two hypothetical chloroplast open reading frames (ycf) involved in chlorophyll biosynthesis from Synechocystis sp. PCC6803 and plants
a Institute of Biology, Plant Physiology, Humboldt University Berlin, Philippstr. 13, 10115 Berlin, Germany b Justus-Liebig-University Giessen, Institute of Micro- and Molecularbiology, IFZ, Heinrich-Buff-Ring 26, 35392 Giessen, Germany