According to Cha official website, Shanghai Bioengineering Co., Ltd. (hereinafter referred to as Bioengineering) was established in 198 1 and listed on the small and medium-sized board of Shenzhen Stock Exchange in 2004. Is an in vitro diagnostic company integrating R&D, production and sales, with rich production experience and complete echelon of medical diagnostic products. The enterprise type belongs to other joint stock limited companies (listed) and non-state-owned enterprises.