Which color on a DNA microarray indicates that a gene is only expressed in cancer cells?

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In a DNA microarray, the colors represent the expression levels of genes in different samples. Specifically, red indicates a high level of expression in the cancer cells relative to normal cells. This means that the gene is predominantly active or "on" in the cancer cells, which can be crucial for understanding the unique characteristics of cancer biology.

In contrast, other colors represent different levels or conditions of gene expression—green indicates that a gene is expressed more in normal cells than in cancer cells, yellow would suggest that the gene has similar expression levels in both types of cells, and black typically indicates no expression of the gene in either sample. Thus, red is specifically significant because it highlights genes that are uniquely and highly expressed in cancer cells, which could be targets for research and treatment.