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Before a sperm cell matures, the histones in genomic DNA must transform into another form automatically, so that the genetic materials from the male are stored in the sperm head in a safer and more condensed way, explained Liu Mofang, the lead researcher on the team at the Institute of Biochemistry and Cell Biology, a branch of the Chinese Academy of Sciences' Shanghai Institutes for Biological Sciences.

Before the attack, police said, Smollett also sent a letter threatening himself to the Chicago studio where "Empire" is shot. The FBI, which is investigating that letter, has declined to comment.

Because of the opposite seasons in the Southern Hemisphere, and the plateau topography of eastern and southern Africa, Kenya, South Africa, Mauritius and other African countries are experiencing one of their coolest seasons, with the highest daytime temperatures falling below 30 C, which is suitable for traveling.

Beijing will invest 235.4 billion yuan (.2 billion) in 300 key projects focusing on infrastructure construction, improvement of people's livelihoods and high-tech industries this year, director of the city's Development and Reform Commission Tan Xuxiang said at a working conference yesterday, Beijing Business Today reported.

Beijing's economy continued to recover from the coronavirus pandemic, as the city's automobile grew for the first time this year, according to the municipal statistics authority.