Hansma Helen Greenwood
Department of Physics, University of California, Santa Barbara, CA 93106, USA.
Life (Basel). 2017 Jun 20;7(2):28. doi: 10.3390/life7020028.
Organelles without membranes are found in all types of cells and typically contain RNA and protein. RNA and protein are the constituents of ribosomes, one of the most ancient cellular structures. It is reasonable to propose that organelles without membranes preceded protocells and other membrane-bound structures at the origins of life. Such membraneless organelles would be well sheltered in the spaces between mica sheets, which have many advantages as a site for the origins of life.
无膜细胞器存在于所有类型的细胞中，通常包含RNA和蛋白质。RNA和蛋白质是核糖体的组成成分，核糖体是最古老的细胞结构之一。有理由推测，在生命起源时，无膜细胞器先于原始细胞和其他膜结合结构出现。这种无膜细胞器在云母片层之间的空间中能得到很好的保护，云母片层作为生命起源的场所具有许多优势。
