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Season 5, episode 3. This player now records resume state for the active profile so browse, account, and detail pages can bring you back here quickly.

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S5 E3

Blueprints in the Bloodstream

It has been known since the turn of the century that there are four human blood groups, based on different red cells and serum characteristics. NOVA looks at the more recent discovery that the different white cell types, as determined by a variety of different molecular markers on the cell surface, open up the possibility of the prevention of disease.

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Season 5

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Episode 1: In The Event of Catastrophe

Episode 2: The Green Machine

Episode 3: Blueprints in the Bloodstream

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