- Genes for the peptidoglycan synthesis pathway are essential for chloroplast division in moss. Machida, M., Takechi, K., Sato, H., Chung, S.J., Kuroiwa, H., Takio, S., Seki, M., Shinozaki, K., Fujita, T., Hasebe, M., Takano, H. Proc. Natl. Acad. Sci. U.S.A. (2006)