Shirako is the milt of fish, known for being rich in nutrients. The history of nucleic acid research originating from salmon milt is particularly long, dating back to the 1870s. This was long before Watson and Crick elucidated the double helix structure of DNA. The nuclear substance extracted from salmon milt was named "Nucleic acid," and research and manufacturing have been continuously pursued by prominent researchers and manufacturers to this day. Nucleic acid research in Japan has been led by the Faculty of Science at Tokyo Imperial University (now the University of Tokyo). In 1951, the first research book on nucleic acids in Japan, "Nucleic Acids and Nucleoproteins - Physical Chemistry, Biology, and Medicine -" was published, covering the extraction and purification methods of nucleic acids and nucleoproteins, the physical properties of nucleic acids and nucleoproteins, enzymatic treatment methods, and the medical and biological perspectives of nucleic acids and nucleoproteins. 720ml Price: 10,700 yen Expiration date: June 2, 2026 The product will be shipped in the box it came in.