Season 5 Episodes21
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Ranked #3 of 7 in Season 5•+0.1 vs season avg
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
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"Blueprints in the Bloodstream" is episode 3 of NOVA season 5. It scored 7.8/10 from 9 votes, ranking #3 of 7 episodes this season (season average 7.7). It aired on January 18, 1978.