How Does Rhogam Prevent Erythroblastosis Fetalis (HDN, Hemolytic Disease of the Newborn)

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How does Rhogam prevent erythroblastosis fetalis (HDN, hemolytic disease of the newborn)?

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The Answer of How Does Rhogam Prevent Erythroblastosis Fetalis (HDN, Hemolytic Disease of the Newborn)