Quantitative expression in primary plasma cells. Quantitative expression of CD138 (A), DHA (B), HOMER 3 (C), and ROCK-1 (D) in primary plasma cells measured by Affymetrix U95Av2 microarray. Gene expression was examined in myeloma (n = 33), MGUS (n = 5), and normal BM plasma cells (n = 5). Box plots define the median values, 25% to 75% of values around the median, and the range of values.