Distributia
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Dilly BarlowHerself - Narrator (voice)
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Lee SilverHimself - Princeton University (as Dr Lee Silver)
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French AndersonHimself - USC School of Medicine (as Dr French Anderson)
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Phil BereanoHimself - University of Washington (as Dr Phil Bereano)
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Dean HamerHimself - National Cancer Institute (as Dr Dean Hamer)
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Keith CampbellHimself - Roslin Institute 1991-97 (as Dr Keith Campbell)
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Steve JonesHimself - University College London (as Prof Steve Jones)
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Alison MurdochHerself - Newcastle Fertility Centre (as Prof Alison Murdoch)