Table II.

High level hematopoietic repopulation by a single early embryonic HSC

Recipient no. Tissues transplanted Time after transplantation Human CD45+ cells in the recipient blood Human CD45+ cells in the recipient BM Human CD45+ cells in the recipient spleen 
  mo % % % 
AGM region 29 42 
AGM region NA NA 
AGM region 24 45 31 
AGM region 39 86 87 
AGM region 73 93 93 
AGM region 22 71 75 
AGM region 90 94 96 
Yolk sac 4.5 NA NA 
Yolk sac 7.5 56 NA NA 
10 Yolk sac 7.5 34 79 87 
Recipient no. Tissues transplanted Time after transplantation Human CD45+ cells in the recipient blood Human CD45+ cells in the recipient BM Human CD45+ cells in the recipient spleen 
  mo % % % 
AGM region 29 42 
AGM region NA NA 
AGM region 24 45 31 
AGM region 39 86 87 
AGM region 73 93 93 
AGM region 22 71 75 
AGM region 90 94 96 
Yolk sac 4.5 NA NA 
Yolk sac 7.5 56 NA NA 
10 Yolk sac 7.5 34 79 87 

NSG mice transplanted with HSCs derived from the human AGM region or yolk sac were observed for 4–8 mo. At the end of each experiment, the percentage of human CD45+ cells in the recipient peripheral blood, BM, and spleen was assessed by flow cytometry. NA, not assessed as the recipients died.

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