60 Seconds

 作者:朱艘蝓     |      日期:2019-02-28 05:08:04
Rats for freedom Rat-catchers beware: the rodents can learn to release one another from plastic traps, sticking to the task even when a tempting chocolate treat was placed nearby to distract them (Science, DOI: 10.1126/science.1210789). Haemophilia therapy Gene therapy has reduced symptoms of haemophilia B – a disorder that results in abnormal blood clotting. Six people with the disease received a gene that codes for an enzyme important in blood coagulation. Levels of the gene rose from less than 1 per cent of normal levels to between 2 and 12 per cent,