The greatest challenge, Keirstead said, was in the engineering.
对基尔斯特德来说，这是临床上的一种巨大挑战。
2
"Creating this complex tissue is a first for the stem cell field, " Keirstead said.
Keirstead说道：“在干细胞研究领域，培育像这样复杂的组织还是首次。
3
"What's so exciting with our discovery, " Keirstead said, "is that creating transplantable retinas from stem cells could help millions of people, and we are well on the way."