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https://www.cd-bioparticles.com/product/absolute-mag-carboxyl-magnetic-particles-3-m-item-whm-ab18-13334.html

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Absolute Mag™ Carboxyl Magnetic Particles, 3 μm (# WHM-AB18) are magnetic particles functionalized with carboxyl groups on the surface. These magnetic particles have exceptionally low background chemiluminescence as demonstrated using an H2O2 chemiluminescence assay.