RNA microarray profiling analysis was performed on 2 different ex-vivo splenic B cell subsets: M-^SIgD+CD27+M-^T (marginal zone B cells) and switched memory M-^SIgG+CD27+M-^T cells, isolated from splenic samples of 4 children (from 4 to 6 yr of age), 3 adults and 3 (or 4) seniors of more than 75 yr.
ORGANISM(S): Homo sapiens