Research in the Cell Biology Division is concerned with molecular mechanisms and structures in algae and plant cells, which underlie the perception and transduction of signals or the modification of cellular processes by signaling. We are focusing on light and gravity signaling, and on the control of polar cell growth. Experimental systems covering a wide range of the evolutionary spectrum are studied: Euglena gracillis (photosynthetic protist), Chlamydomonas (green alga), Physcomitrium patens (moss) and tobacco (vascular plant). Investigations are based on cutting edge cell biological, molecular biological, biochemical and genetic methodology.