Human alpha defensin-5 (HD5) is one of six peptides belonging to the alpha defensin family. Defensins are small peptides involved in immunological defense against viral and microbial infections through either direct interaction with pathogens or in combination with other immune system factors. There are three subfamilies of defensins (α, β, and θ). α defensins are only observed in mammals and are mainly β-sheet structures. Alpha defensin-5 (HD5) is primarily expressed in the Paneth cells found within the small intestine, and has been shown to possess activity against both Gram-positive and Gram-negative microbes. Studies have shown alpha defensin-5 (HD5) to be a strong antagonist towards human Papillomavirus infection. It may also play a role Crohn’s disease.，官网链接：https://www.sigmaaldrich.cn/product/mm/mabf31 默克 科研、开发、生产。 作为生命科学行业的全球领先供应商，我们致力于为科研、生物技术开发和生产，以及制药药物疗法开发和生产提供各类解决方案和服务。

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