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What is a "gene expression signature" for a tumor?

Answer:

A collection of genes that are expressed consistently higher or lower in the tumor than is the population norm for non-tumorous tissue of the same type.

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Artificial intelligence and data-mining systems often use "training data sets" and "test data sets." Define these terms and describe briefly how these data sets are used.	What are the benefits of high-throughput expression analysis in molecular biological investigations?