Virus from one of the patients shows mutations at the receptor-bindingsite.
来自患者之一的病毒显示在受体结合部位突变。
2
That is, even if we knew these binding-site conversions to be feasible, would that give us any reason to think that the more profound conversions are feasible?
Furthermore, returning to the first question, it seems that even humble binding-site conversions are typically beyond the reach of Darwinian evolution.