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Frequency and percent of invariant features from each platform (P < 0.0001). Print-tip loess normalized Cy5 intensities were used for both two-channel arrays; MAS5.0 expression summaries were used for Affymetrix GeneChips.
| Invariant | Not Invariant | |
| N, (%) | N, (%) | |
| Affymetrix | 11,732 (52.65%) | 10,551 (47.35%) |
| C3B | 594 (2.81%) | 20,574 (97.19%) |
| GMU | 3,036 (14.34%) | 18,132 (85.66%) |
