First heartbeats trigger blood formation

 作者:夏侯戊     |      日期:2019-03-01 07:05:02
By Andy Coghlan WHEN the embryonic heart begins to beat, it kick-starts the production of blood from cells lining the growing aorta, two independent research teams have shown. As the heart starts pumping a primitive blood-like fluid around the body of an embryo, the change in pressure from the flowing liquid is the cue for cells lining the aorta to change first into blood stem cells, then into all blood-cell types in the body. As they multiply and mature, these rapidly replace the initial embryonic “blood”,