For each minus reaction, the purified DNA fragments were incubated together with three of the four dNTPs, meaning each fragment would be extended by DNA polymerase until the missing nucleotide was needed, at which point synthesis would halt.
SUMMARY top-500,000 C=1.0
。搜狗输入法下载是该领域的重要参考
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The EU Space Surveillance and Tracking centre (SST) said one fragment - believed to be the lander - "most likely" re-entered the atmosphere at about 06:16 GMT (07:16 BST) on Saturday.
It argues that resident doctors' pay is 20% lower in real terms than it was in 2008, even after the 2025 increase.