Assay performance on RNA from frozen tissues and artificially degraded reference RNA. DASL-based expression profiling produces higher correlations between frozen tissue-based RNA samples and reference RNA samples regardless of RNA degradation. Scatterplots, histograms, and correlation of frozen tissue-based RNA and reference RNA profiling on IVT- and DASL-based platforms are shown. For example, correlation between UMB4849 (RIN = 6.3) and UMB4721 (RIN = 2.4) is 0.14 for IVT (four top left boxes) but 0.84 for DASL (four top left boxes under "DASL Frozen"). For the IVT-based samples, histogram shows clustering of detected intensities for UMB4721 at background levels, and skewing of the scatterplot away from y = x. In contrast, the distribution of UMB4721 profiled by DASL appeared similar to UMB4849, and the scatterplot showed adherence to the y = x line. RIN of tissue sample or reference sample are listed in the histogram box. Cor = correlation.