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pubmed-article:8714747pubmed:abstractTextIn amniote vertebrates, the development of form and structure of the limb bud is accompanied by precise patterns of massive mesodermal cell death with morphological features of apoptosis. These areas of cell death appear to eliminate undifferentiated cells which are required only for a limited time period of limb development. Predictable skeletal and morphological anomalies of the limb occur when the pattern of cell death is modified in mutant species or under experimental conditions. Most evidence points to the occurrence of local triggering mechanisms to account for the establishment of the areas of cell death and the subsequent activation of cell death genes. Modifications of the extracellular matrix and diminution in the contribution of growth factors by neighbouring tissues appear as the most likely potential candidates for triggering the cell death program. Information on the genetical basis of cell death in the developing limb is very scarce. Among the increasing number of cell death genes identified in other cell death systems, such as p-53 and the ced-3/ICE and ced-9/ bcl-2 gene families, only bcl-2 has been studied in detail during limb development and yet, the information obtained is contradictory. Bcl-2 is not expressed in the areas of cell death of the developing limb, but normal limbs develop in mice with disruption of the bcl-2 gene. Obviously, the clarification of the role of the cell death genes constitute a major task in future studies of cell death in the developing limb.lld:pubmed
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pubmed-article:8714747pubmed:pagination519-33; discussion 533-4lld:pubmed
pubmed-article:8714747pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:8714747pubmed:year1995lld:pubmed
pubmed-article:8714747pubmed:articleTitleCell death in the embryonic developing limb.lld:pubmed
pubmed-article:8714747pubmed:affiliationDepartamento de Anatomía y Biología Celular, Universidad de Cantabria, Santander, Spain.lld:pubmed
pubmed-article:8714747pubmed:publicationTypeJournal Articlelld:pubmed
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