The BrdU cell proliferation assay is a rapid, simple and high sensitive method to assess cell proliferation. With the high resolution data of cell proliferation acquired from this assay, a further understanding of the mechanisms of cell proliferation can be achieved and many molecular mediators that could regulate cell proliferation can be identified including hormones, signaling components and transcriptional factors. Custom service is also available. This assay can be modified to generate a more targeted result according to the purpose of the research.