
On August 10, 2022, Panacell Biotech Co., Ltd. said that natural killer (NK) cells, exosomes, and brown adipose-derived stem cells are effective to treat patients with long COVID conditions, or post COVID-19 conditions, as well as those with terminal illness. Panacell Biotech is South Korea's research institute specializing in advanced regenerative medical cell therapy using adipose-derived stem cells (ADSC). The company announced on August 10,2022 that it will soon conduct those cells' and exosomes’ toxicity tests through clinical trials and laboratory animals.