Nucleolus and chromatin fibres. Coloured high resolution scanning electron micrograph (SEM) of the nucleolus and chromatin fibres of a primordial testis germ cell nucleus (8-week-old human embryo). The nucleolus (centre) is a specialized region of the nucleus. It is the site for synthesis of ribosomal RNA and proteins. Surrounding the nucleolus are chromatin fibres. The chromatin fibres form a diffuse network which contains the chromosomes. The chromosomes contain the genetic instructions for an organism but only become visible when the cell divides. Magnification unknown | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / PROFESSORS P. MOTTA & T. NAGURO |
Taille de l’image : | 3262 px × 4641 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |