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Preservation of regulatory T cells (Tregs) and their Helios+ subset in paediatric HIV. Correlation of the frequencies of Tregs and their Helios+ subset with (a) the frequencies and (b) numbers of CD4. (c) Numbers of Tregs and their Helios+ subset versus CD4 numbers. (d) Frequencies and numbers of Tregs versus Helios+ subset; n = 60.
