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■ Secreted by kidney cells when blood oxygen is low.
■ Targets cells in red bone marrow that will become red blood cells.
■ Promotes increased numbers of mature red blood cells.
■ More mature red blood cells carry more oxygen so blood oxygen level is restored to normal.
![](https://i.ytimg.com/vi/ZCjSGr-ywFU/maxresdefault.jpg)