NOVA Season 4 Episode 20
The Green Machine
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.
4 - 20The Green MachineJan. 11, 1978- 4 - 19The New HealersJun. 29, 1977
- 4 - 18Across the Silent BarrierJun. 22, 1977
- 4 - 17Linus Pauling: Crusading ScientistJun. 01, 1977
- 4 - 16Tongues of Men (2)May. 18, 1977
- 4 - 15Tongues of Men (1)May. 11, 1977
- 4 - 14The Red PlanetApr. 27, 1977
- 4 - 13The Business of ExtinctionApr. 20, 1977
- 4 - 12The Dawn of the Solar AgeApr. 20, 1977
- 4 - 11The Wolf EquationMar. 30, 1977
- 4 - 10The Human AnimalMar. 23, 1977
- 4 - 9The Gene EngineersMar. 16, 1977
- 4 - 8The Pill for the PeopleMar. 09, 1977
- 4 - 7Bye Bye BlackbirdMar. 02, 1977
- 4 - 6Incident at Brown's FerryFeb. 23, 1977
- 4 - 5The Plastic PrisonFeb. 09, 1977
- 4 - 4The Sunspot MysteryFeb. 02, 1977
- 4 - 3What Price Coal?Jan. 19, 1977
- 4 - 2The Hot Blooded DinosaursJan. 12, 1977
- 4 - 1Hitler's Secret WeaponJan. 05, 1977
