Dee Lauzon, Sue Lancelle, Marian Rice (2012) CIL:39755, Mus musculus, cardiac muscle cell. CIL. Dataset

Transmission electron micrograph showing the nucleus of a mouse cardiac tissue with nucleolus. At the center of the image is a large structure called the nucleus which is a membrane-limited compartment within the cell that contains the genetic material, DNA, in the form of chromosomes. Within the nucleus is the nucleolus is a small, darkly staining mass within the nucleus wherein ribonucleoprotein is produced. Within the nucleolus it is easy to see the four small circular areas called the nucleolar organizing region is initially where RNA and its associated proteins are processed.

透射电子显微镜下展示的鼠标心肌组织的细胞核及其核仁。图像中央可见一个被称为细胞核的大型结构，它是由细胞膜所包围的细胞器，其中包含着以染色体形式存在的遗传物质——DNA。在细胞核内部，存在一个称为核仁的小型、染色较深的质块，其中产生核糖核蛋白。在核仁内，可以轻易观察到四个被称为核仁组织区域的微小圆形区域，这些区域最初是RNA及其相关蛋白质的处理场所。