The qBiomarker copy number PCR system measures changes in gene copy number with good resolution and reliability. With a range of real-time PCR assays available for copy number studies, researchers can choose from over 10 million assays to analyze changes in copy number at a resolution of 200 base pairs. The assays are available pre-printed in PCR-ready arrays with catalogued content or user-defined custom content. These custom arrays can work well for verifying aCGH or SNP-chip discovery experiments.