通过研究一种蛋白质的进化历程，一个科研小组声明：答案是不行！新的突变是不可能使进化朝向逆转方向的。
Examining the evolution of one protein, a team of scientists declares the answer is no, saying new mutations make it practically impossible for evolution to reverse direction.
新计划采用七个埃希式大肠杆菌群落取代引信，每个菌落都被赋予一个产生不同荧光的蛋白质的基因。
The new scheme replaces the fuse with seven colonies of Escherichia coli bacteria, each given a gene for a different fluorescent protein.
他订购了一批新的蛋白质，应该是一个多月前到达，但仍未交付。
He ordered a fresh batch of protein that was supposed to arrive more than a month ago, but still hasn't been delivered.
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