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In general, band 3 stained more densely adjacent to the IgG clusters, but this clustering of band 3 was sometimes difficult to photograph in the same focal plane as the clumps of IgG. Quantitative analysis of erythrocytes collected and stained 78 days after re-infusion of the biotinylated cells revealed that ?25% of the biotinylated population displayed both clustered band 3 and cell surface IgG. By 92 days after re-infusion of biotinylated cells nearly 80% of the biotinylated fraction showed clustered band 3 and attached IgG, suggesting that band 3 clustering and IgG binding may constitute a marker for cell aging. Figure 2 shows labeled RBC 126 days after reinfusion. These cells, which are close to http://www.selleckchem.com/products/BEZ235.html the end of their lifespan, generally have an irregular morphology, and in some cases exhibit a very uneven and perhaps http://www.selleck.cn/products/gsk-j4-hcl.html discontinuous distribution of band 3 in the membrane. These morphological abnormalities were not observed when biotinylated cells collected http://www.selleckchem.com/products/byl719.html density of unlabeled RBC. The density profile of biotin-labeled RBC immediately after reinfusion was essentially identical to the unlabeled RBC, indicating that no change in cellular hydration occurred during labeling. As the labeled cells aged, there was a shift to higher density that occurred mostly in the first 1 or 2 weeks (Fig. 3), followed by smaller changes in the following months. Most of this early shift was from the relatively light fraction 3 (1.090-1.095 g/cc) to more dense fractions.