。。zzxz

More furin cuts mean more spike proteins primed to enter human cells. In SARS-CoV, less than 10% of spike proteins are primed, says Menachery, whose lab group has been quantifying the primed spike proteins but is yet to publish this work. In SARS-CoV-2, that percentage rises to 50%. In the Alpha variant, it’s more than 50%. In the highly transmissible Delta variant, the group has found, greater than 75% of spikes are primed to infect a human cell.

Known unknowns
The scientific community is still scratching the surface of its understanding of SARS-CoV-2. Key unknowns include the number of ACE2 receptors needed to bind to each spike protein; when exactly the S2 site is cleaved by TMPRSS2; and the number of spikes needed for virus–cell membrane fusion, says McLellan — and that’s just for entry. In April 2020, a team at the University of California, San Francisco, identified at least 332 interactions between SARS-CoV-2 and human proteins25.

It is not easy to keep pace with the quickly mutating virus. Most mutations so far are associated with how effectively the virus spreads, not with how much the virus damages the host, experts agree. This month, a study reported that the Delta variant grew more rapidly and at higher levels inside people’s lungs and throats than did earlier versions of the virus26.

But it is not yet certain how Delta’s mutations have supercharged the variant in this way, says Stern-Ginossar. “This is something many labs are trying to figure out.”

印度使用MRNA的比率应该是蛮低的，不过从选择角度看，专对这个S蛋白干，确实会导致S蛋白变异体更多存活下来

俺感觉。zzz

然后美国现在貌似已经很了解疫苗对病毒反向影响了

质疑的吧哈哈哈

OK？

难道要逼俺读paper再来反馈？也不是不可以啦，不过俺的理解能力也只是有限级嘿嘿

核酸可分为核糖核酸（简称RNA）和脱氧核糖核酸（简称DNA）。DNA是储存、复制和传递遗传信息的主要物质基础，RNA在蛋白质合成过程中起着重要作用

生物课开始了哟

。zzzz

以为大家都没读过。。。

一样的吧

不过读了多少书又怎样？全世界都围着这个病毒转了快两年，全球的理解力加起来都没有病毒变异速度快。。zzz

俺也不奇怪哈哈哈