He reckons falciparum was once controlled by variant darc . But no longer .

他认为恶性疟原虫曾一度被darc变异体控制，但这种情况没有继续下去。

The mystery is why the variant of darc that leaves red blood cells without receptors should be so harmful .

令人困惑的是darc的变异体导致红细胞缺少受体为什么会这么有害。