p.21 3.關於hematogenesis，我想應該是像下面的敘述
而不是只持續到第五週~
Primitive blood cells and plasma--develop from endothelial cells of vessels in
yolk sac and allantois at the end of the 3rd week. It occurs in embryo (liver
first, than spleen, bone marrow and lymph nodes) in the 5th week.
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