Sigma Aldrich (sigma Aldrich; also known as sigma orrich), one of the top ten manufacturers of precision chemical materials in the world, was established in St. Louis, Missouri, USA in 1951. It is committed to providing biochemical and organic chemical products and kits for scientific fields such as genome research, biotechnology, drug research and development, disease diagnosis, etc.; Forbes in 2014 It ranks 1512 among the top 2000 global enterprises.
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