Studies of protein trap expression We compared the apparent intensity of GFP-protein staining in the GSCs with the RNA level of the corresponding gene as determined by Affymetrix arrays (Kai et al. 2005). Studies of protein trap expression We compared the apparent intensity of GFP-protein staining in the GSCs with the RNA level of the corresponding gene as determined by Affymetrix arrays (Kai et al. 2005). (A–F) The pattern of protein trap expression of the indicated gene (see Table 4 for strain names). The expression level from Affymetrix software (mean of three measurements) is given. Michael Buszczak et al. Genetics 2007;175:1505-1531 Copyright © 2007 by the Genetics Society of America