1. Department of Biology, California State University, Bakersfield, Bakersfield, CA 93311, USA;
2. Michigan State University, Department of Plant Biology, East Lansing, MI 48824, USA;
3. Biological Sciences Department, California State Polytechnic University, Pomona, CA 91768, USA;
4. Natural Science Division, Pepperdine University, Malibu, CA 90263, USA