mortality/aging
• mice displaying a high level of chimerism for cells derived from injected or aggregated ES cells with this targeted allele die during development
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cellular
• this phenotype can only be studied in chimeric mice
• glycosyl phosphatidyl inositol (GPI) anchors are absent in some erythrocytes and B lymphocytes in mice with a low level of chimerism
• a higher incidence of CD4+ and CD8+ cells that are also GPI-
• the number of GPI- erythrocytes may increase in mice that are greater than 12 months of age
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