Rapid advances in stem cell biology have raised exciting possibilities of replacing damaged or lost tissues and cells by activation of in vitro-expanded stem cells or their progeny.

• 迅速前进在干细胞生物学举起替换损坏或者丢失组织和细胞以在试管内扩大的干细胞或者他们的子孙的活动的令人激动可能性。