Histograms of Xl-PSID intensity values. A. Distribution of average Xl-PSID intensities for all experimental Xl-PSIDs (n =15, 491). Shaded areas are Xl-PSIDs with GCOS absent calls in all three replicates (n = 3, 314). B-F. Distribution of average intensities for Xl-PSIDs in the five gene categories: B, inner ear tissue (IET/Xl-PSIDs, n = 453); C, deafness (DF/Xl-PSIDs, n = 139); D, ion channel (IC/Xl-PSIDs, n = 74); E, ion transport (IT/Xl-PSIDs, n = 180); F, transcription factors (pTF/Xl-PSIDs, n = 795). Shaded areas are Xl-PSIDs with GCOS absent calls in all three replicates (B, IET/Xl-PSIDs, n = 92; C, DF/Xl-PSIDs, n = 33; D, IC/Xl-PSID, n = 22; E, IT/Xl-PSIDs, n = 52; F, pTF/Xl-PSIDs, n = 328). Vertical line separates the percentage of Xl-PSIDs intensities above and below four.