So we went back to these specimens and we started digging around, and particularly, we looked into the teeth of skulls, hard parts where humans had not been able to get their fingers, and we found much better quality DNA.
所以我们又回去仔细研究这个样本， 特别是头骨中的牙齿部分， 这些坚硬的部分没有人用手碰过。 这回我们提出了更高质量的DNA，