They harbor indigenously circular as well as linear plasmids,a useful source for developing genetic tool for studying of their unique physiology and metabolism.

• 在许多稀有放线菌中发现了环型与线型质粒,由质粒发展起来的遗传操作系统可以为研究稀有放线菌的生理及代谢提供强有力的工具。