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CHINA-SHANGHAI-COMMUNITY HEALTH CENTERS-COVID-19 DRUGS (CN)

(230109) -- SHANGHAI, Jan. 9, 2023 (Xinhua) -- A doctor prescribes small-molecule COVID-19 drugs for a patient at a community health service center in Minhang District in east China's Shanghai, Jan. 8, 2023. Small-molecule COVID-19 drugs have been put into use in community health service centers in Shanghai. (Xinhua/Wang Xiang)

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CHINA-SHANGHAI-COMMUNITY HEALTH CENTERS-COVID-19 DRUGS (CN)

(230109) -- SHANGHAI, Jan. 9, 2023 (Xinhua) -- Wang Liyun (R), head of medical department, and a staff member from nursing facility, checks distribution list for small-molecule COVID-19 drugs at a community health service center in Minhang District in east China's Shanghai, Jan. 8, 2023. Small-molecule COVID-19 drugs have been put into use in community health service centers in Shanghai. (Xinhua/Wang Xiang)

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CHINA-SHANGHAI-COMMUNITY HEALTH CENTERS-COVID-19 DRUGS (CN)

(230109) -- SHANGHAI, Jan. 9, 2023 (Xinhua) -- A patient registers at a community health service center in Minhang District in east China's Shanghai, Jan. 8, 2023. Small-molecule COVID-19 drugs have been put into use in community health service centers in Shanghai. (Xinhua/Wang Xiang)

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CHINA-SHANGHAI-COMMUNITY HEALTH CENTERS-COVID-19 DRUGS (CN)

(230109) -- SHANGHAI, Jan. 9, 2023 (Xinhua) -- A pharmacist checks a prescription at a community health service center in Minhang District in east China's Shanghai, Jan. 8, 2023. Small-molecule COVID-19 drugs have been put into use in community health service centers in Shanghai. (Xinhua/Wang Xiang)

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Nobel medal auctioned off for over $2 million

NEW YORK, United States - Photo shows the Nobel Prize in Physiology or Medicine awarded to British molecular biologist Francis Crick in 1962 for his discovery of the structure of the DNA molecule. The medal was auctioned off for $2.27 million in New York on April 11, 2013.

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Nobel medal auctioned off for over $2 million

NEW YORK, United States - Photo shows an auction held in New York on April 11, 2013, in which the Nobel Prize in Physiology or Medicine awarded to British molecular biologist Francis Crick in 1962 for his discovery of the structure of the DNA molecule, was auctioned off for $2.27 million.

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Researchers succeed in knotting DNA molecule

A group of Japanese researchers have succeeded in knotting a single DNA molecule, an operation they say is the first in the world. The scientists attached beads to both ends of a molecule of DNA in lambda phage, a cell-destroying virus found in coli bacillus, and used optical tweezers to maneuver the beads to tie a knot. The photo was provided by a Keio University research group that took part in the experiment.