On May 24, 2011, General Administration of Quality Supervision, Inspection and Quarantine of the State Administration of Quality Supervision, Inspection and Quarantine [2011] 339 "Notice on Approval of 236 National Standard Substances such as Calf Thymus DNA Content Standard Substances" approved and issued 46 National Standard Substances developed by Jinan Zhongbiao Science and Technology Co., Ltd. The license numbers for manufacturing measuring instruments are "National Standard Substances 10001109 and 1001111".