ALEXANDRIA, Va., July 16 -- United States Patent no. 12,668,779, issued on June 30, was assigned to CENTRAL SOUTH UNIVERSITY (Changsha, China).

"Method for in vitro expansion of cryopreserved cord blood-derived regulatory t cells (Tregs) with high recovery rate" was invented by Zhiguang Zhou (Changsha, China) and Haibo Yu (Changsha, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for in vitro expansion of cryopreserved cord blood-derived regulatory T cells (Tregs) with a high recovery rate is provided, including the following steps: recovering the cryopreserved cord blood-derived Tregs after first expansion, and resuspending the cells with a serum-free medium; and adding a resulting suspension ...