Thus, the marrow and peripheral blood of adults (minors under 18 cannot donate blood or marrow) and the cord blood of newborns are our principal sources of stem cells at this point.
因此，成人的骨髓、周邊血（18 歲未成年前不得捐血及骨髓）和嬰兒臍帶血，就成了目前收集幹細胞的主要來源。