[1] Univ Calif Berkeley, Dept Bioengn, Berkeley, CA 94720 USA
[2] Univ Minnesota, Dept Plant Biol, St Paul, MN 55108 USA
[3] MIT, Biol Engn Div, Cambridge, MA 02139 USA
[4] Univ Calif Santa Barbara, Dept Chem Engn, Santa Barbara, CA 93106 USA
[5] Entelos, Foster City, CA USA