To study gene expression from a particular sample of cells, what material is usually hybridized to a dna microarray?

To study gene expression from a particular sample of cells, the material which is usually hybridized to a DNA microarray is:

Explanation:

gold discovery in california, and pioneer settlers were sometimes pulled west because they wanted to make a better living. others received letters from friends or family members who had moved west. these letters often told about a good life on the frontier. the biggest factor that pulled pioneers west was the opportunity to buy land.

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answer; earthquake;