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Expression levels of DXZ4 varied significantly between males, but did not relate to the size of the array, nor did inheritance of the same array result in similar expression levels.
As further evidence that a low level of silencing was occurring in these animals even in the absence of heat shock, sur-5::gfp expression from the transgenic array in the WT strain was lower than that of the same array in the rde-1 or rde-4 mutant background (Fig. 5A, compare - lanes between strains).
Technical issues need to be addressed to combine data that originates from the different platforms, or different versions of the same array generated by the manufacturer.
Thus, normalization of background-subtracted images of the same array for different hybridizations was accomplished essentially by multiplying all pixels in the non-reference image by a constant scale-factor, the value of which had been estimated by SVD.
Three or two independent targets for each tissue and each protocol (target replicates) were thus generated and hybridised to 4 replicates of the same array (array replicates), so that 48 measurements per probe were generated for somatic (3 targets × 2 tissues × 2 protocols × 4 arrays) and embryonic samples (2 targets × 3 tissues × 2 protocols × 4 arrays).
This is demonstrated for several arrays and ScanArray4000 I in Figure 2, where relationships between intensities in two scans of the same array, obtained at different PMT voltages, are shown for the red (A, B, C) and green (D, E, F) channel separately.
Similar(53)
The relative expression level of each gene was represented by the median of ratio (Cy5/Cy3) averaged from the four replicates of a gene on the same array.
All probe set values were normalized to the 5th percentile value of all probe sets on the same array.
This distinct behavior of a group of genes represented on the same arrays excluded batch or normalization artifacts.
This and the more elaborate evaluation presented in Additional file 1 suggest three major explanations for the good performance of the AGL platform: co-hybridization of samples from the two different biological groups to the same array, doubling of the number of observations with the same number of arrays used for the one-color systems, and low noise levels.
Once they became citizens, immigrants would be entitled to the same array of government benefits as other Americans.
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