False-colour transmission electron micrograph of erythroblasts,primitive red blood cells,in human bone marrow. Erythropoiesis,the formation of mature red cells,is directed towards the production of a cell without organelles such as a nucleus; instead it is packed with haemoglobin. These primitve cells still show the nuclei as dominant oval shapes surrounded by pink cytoplasm. An original stem cell differentiates to form a proerythroblast,a large nucleated cell with no haemoglobin. The increase in haemoglobin proceeds with a gradual loss of all organelles. Magnification: x 5000 at 6x7cm size | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / CNRI |
Taille de l’image : | 4311 px × 5335 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |