A microarray (also known as DNA chip or biochip) is a laboratory tool used to detect the expression of thousands of genes simultaneously or to genotype multiple regions of a genome. It's a small solid support (like a glass slide or silicon chip) spotted with DNA fragments. By measuring the amount of mRNA or DNA that binds to the probes on the microarray, scientists can determine the relative expression levels of different genes or identify specific DNA sequences in a sample. It's commonly used in research to study gene expression, identify genetic variations, and diagnose diseases.
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