tag:blogger.com,1999:blog-378000142011-04-21T22:20:49.406-07:00pseudonymousenoreply@blogger.comBlogger51100tag:blogger.com,1999:blog-37800014.post-1164592044722262062007-12-31T23:59:00.000-08:002006-11-27T21:28:23.276-08:00<a id="stem" name="stem"></a><strong>Stem cells</strong> are <strong>pluripotent</strong> or <strong>totipotent</strong> undifferentiated cells capable of self-renewal through numerous cycles of cell division (proliferation). Stem cells are categorized as<strong> embryonic</strong> (blastocysts) or <strong>adult </strong>stem cells (umbilical cord blood, <a href="http://tissue-histopathology.blogspot.com/2007/12/bone-marrow.html">bone marrow</a>).<br /><br /><a id="progenitor" name="progenitor"></a>Stem cells differentiate into <strong>progenitor cells</strong>, which are more developmentally committed to a cell line than are stems, but which are nevertheless undifferentiated or immature in comparison to those cells that have differentiated and matured into <a href="http://tissue-histopathology.blogspot.com/1990/01/site-map.html">specialized tissue cells</a>. Progenitor cells are <strong>multipotent</strong> or <strong>unipotent</strong>.<br /><br />Tissue damage or <a href="http://cellular-immunity.blogspot.com/2007/12/immune-response.html">immune stimuli</a> can <strong>activate</strong> progenitor cells through <a href="http://chemistryolife.blogspot.com/2007/12/growth-factors.html">growth factors</a> or <a href="http://cellular-immunity.blogspot.com/2007/12/immune-cytokines.html">cytokines</a>, leading to increased <a href="http://biologyofcells.blogspot.com/2007/12/reproduction.html">cell division</a> important for the repair process.<br /><br />[] <a href="http://www.deltagen.com/target/histologyatlas/atlas_files/hematopoietic/bone_marrow_40X.jpg">labeled photomicrograph of bone marrow</a>, <a href="http://www.brown.edu/Courses/BI0032/adltstem/adult-stem-cell.gif">diagram of adult stem cell plasticity</a>, <a href="http://www.brown.edu/Courses/BI0032/adltstem/stem-cell.gif">diagram of stem cell versus progenitor cell</a> []<br /><br />ọ <a href="http://tissue-histopathology.blogspot.com/2007/12/blood.html">blood</a> ọ <a href="http://tissue-histopathology.blogspot.com/2007/12/bone-marrow.html">bone marrow</a> embryological tissue ọ <a href="http://tissue-histopathology.blogspot.com/2007/11/ectoderm.html">ectoderm</a> ọ <a href="http://tissue-histopathology.blogspot.com/2007/11/mesoderm.html">mesoderm</a> ọ <a href="http://tissue-histopathology.blogspot.com/2007/11/endoderm.html">endoderm</a> ф <a title="external link" href="http://cellular-immunity.blogspot.com/2007/12/hematopoiesis.html">hematopoiesis </a><br /><br />Tables  <a href="http://tables-evo-sci.blogspot.com/2007/04/fc-receptors.html">Fc receptors</a>  <a href="http://tables-evo-sci.blogspot.com/2007/07/immune-cytokines.html">Immune Cytokines</a>  <a href="http://tables-evo-sci.blogspot.com/2007/04/immunoglobulins.html">Immunoglobulins</a>  <a href="http://tables-evo-sci.blogspot.com/2007/07/cell-adhesion-molecules.html">Cell Adhesion Molecules</a>  <a 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/></div>Arcanumnoreply@blogger.com0tag:blogger.com,1999:blog-37800014.post-59815955531492762681990-01-01T01:00:00.001-08:002007-07-03T20:12:46.615-07:00• <a href="http://abiogenesisevo.blogspot.com/">Abiogenesis and Evolution</a> • <a href="http://evolutionary-algorithms.blogspot.com/">Algorithms of Evolution</a> • <a href="http://euarch.blogspot.com/">Archea Eubacteria</a> • <a href="http://oncologic.blogspot.com/">Cancer</a> • <a href="http://biologyofcells.blogspot.com/">Cell Biology</a> • <a href="http://complexity-in-systems.blogspot.com/">Complex Systems</a> • <a href="http://cyanophyta.blogspot.com/">Cyanobacteria</a> • <a href="http://tables-evo-sci.blogspot.com/">Diagrams Tables</a> • <a href="http://endosymbionts.blogspot.com/">Endosymbiosis</a> • <a href="http://enzymatics.blogspot.com/">Enzymes</a> • <a href="http://evolution-development.blogspot.com/">Evo Devo</a> • <a href="http://evo-in-action.blogspot.com/">Evolution in Action</a> • <a 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Life</a> • <a href="http://paleogeology.blogspot.com/">Paleogeology</a> • <a href="http://krebbing.blogspot.com/">Pathways</a> • <a href="http://phototroph.blogspot.com/">Photosynthesis</a> • <a href="http://proteian.blogspot.com/">Protein</a> • <a href="http://signaling-receptor.blogspot.com/">Receptor</a> • <a href="http://mineral-rock.blogspot.com/">Rocks & Minerals</a> • <a href="http://serialendosymbiosis.blogspot.com/">SET</a> • <a href="http://of-signal-importance.blogspot.com/">Signaling</a> • <a href="http://hypo-somnia.blogspot.com/">Sleep</a> • <a href="http://stem-and-progenitor.blogspot.com/">Stem &amp; Progenitor Cells</a> • <a href="http://stromatolites.blogspot.com/">Stromatolites</a> • <a href="http://tabula-flexuosa.blogspot.com/">Tabula Flexuosa</a> • <a href="http://taxonomy-phylogeny.blogspot.com/">Taxonomy Phylogeny</a> • <a href="http://tissue-histopathology.blogspot.com/">Tissue</a> • <a href="http://virions.blogspot.com/">Virus</a> •<div 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