Bone marrow contains special blood cells, 骨髓含有特殊的血细胞, which constantly divide toproduce new cells to replace the ones that have been destroyed. 这种细胞会不断分离产生新的细胞来取代那 些已被破坏的细胞。 Why all this bloody business inthe bone marrow? 为什么所有的造血工作都在骨髓中...
Divide and Define: Clues to Understanding How Stem Cells Produce Different Kinds of CellsThe human body contains trillions of cells, all derived from a single cell, or zygote, made by the fusion of an egg and a sperm. That single cell contains all the genetic information ...
The stem cells cluster and are easy to identify; they divide to produce another germ line stem cell and a differentiating cell called a gonialblast, which goes on to eventually become a sperm cell. The researchers marked the copies of each chromosome in theDrosophilastem cells as they divided....
Introduction Protein destruction may seem like a strange way for a cell to control its growth. The entire process by which cells multiply is based on synthesis- the duplication of almost every molecule in the cell. If protein synthesis is one of the foundations of growth, then why are so ...
Steve Reiner, MD, professor of Medicine, and Burton Barnett, a doctoral student in the Reiner lab at the Perelman School of Medicine at the University of Pennsylvania, have shown how immune cells, called B lymphocytes, are able to produce daughter cells that are not equal, a finding that mi...
called DNA replication), which relies on a protein called RPA. Cells have a limited amount of this protein, which they use as 'band aids' to protect the DNA temporarily during replication. If they use up the RPA reservoir, their DNA breaks severely and cells are no longer able to divide...
To replace worn-out red blood cells, hemopoietic stem cells in the bone marrow divide and differentiate into new red blood cells. Bone marrow also contains a second type of adult stem cell known as a stromal or mesenchymal stem cell. Stromal stem cells become bone, cartilage, fat and ...
Bone marrow contains hematopoietic stem cells, and these cells functions to produce red blood cells, platelets, and white blood cells. There are some conditions in which the hematopoietic stem cells of bone marrow are unable to produce these blood cells properly, and these conditions include ...
Making cells immortal allows vigorous new tissues to be grown from a person's own cells. The technique could improve the quality of a wide range of engineered tissues, from replacement arteries and corneas to skin gr...
How many somatic cells are produced in mitosis?Cell Division:Mitosis is the process of somatic cells dividing. Cells must divide to replace old, dying cells, and for the organism to grow. Mitosis is a highly regulated process to ensure exact copying of the DNA....