转帖一 成功英语演讲的秘诀: 开场白、结束语 应对问题 -I will be pleased to answer any questions you may have at the end of the presentation. -Please can you save your questions till the end. -If you have any questions, I will be pleased to answer them at the end of the presentation. -the ...
Oncogene, 2006,25,7663-7672. Embryonic stem cells are characterized by their differentiation to all cell types during embryogenesis. In adult life, different tissues also have somatic stem cells, called adult stem cells, which in specific niches can undergo mul ...