Differentiating stem cell (CD34+) from umbilical cord blood, scanning electron micrograph (SEM). Shown here is the first stage of a CD34+ stem cell differentiating in to another blood cell type. Note the new protoplasmic bulge forming at one position on the stem cell periphery; this new growth extension of the cell is the first morphological sign of the stem cell developing in to another cell type. CD34+ stem cells are normally found in the umbilical cord and bone marrow as hematopoietic stem cells. They are multipotent; they differentiate to produce precursor (progenitor) cells of any of the body's blood cell types. This process of stem cell differentiation in the circulatory system is called hemopoiesis. CD34 is a cell surface glycoprotein and functions as a cell-cell adhesion factor. Magnification: x2, 600 when shortest axis printed at 25 millimeters. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / DENNIS KUNKEL MICROSCOPY |
Bildgröße: | 2726 px × 3206 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |