Stem cells in the circulation.
D001773:Blood Cells / Q000166:cytology*; D002452:Cell Count; D002455:Cell Division; D002478:Cells, Cultured; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D006801:Humans; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000097:blood*; D007234:Infant, Premature; D007700:Kinetics