Fig. 3.
Distribution of CD28+CD27+, CD28−CD27−, CD45RO+CD27−, CD45RO−CD27+, CD45RA+CD27+, CD45RA−CD27−, CD45RO+CD28−, CD45RO−CD28+, CD45RA+CD28+, CD45RA−CD28− cells within CD4+ cells in young (white bars) and elderly (black bars)
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