Gene array comparisons of CD21^−/lo and CD21⁺ naive B cells from RA and CVID patients using the Affymetrix Human Genome U133 Plus 2.0 Array. (A) Transcripts differentially expressed by CD21^−/lo and CD21⁺ naive B cells from 2 RA and 3 CVID group Ia patients are shown. (B) Selected transcripts well known to B-cell biology or of potential interest are presented. Up- and down-regulated transcripts are indicated in red and green, respectively. The magnitude of expression is depicted by the color bar.