True Blood | Blood | In Cold Blood | Harry Potter and the Half-Blood Prince | blood | First Blood | Blood, Sweat & Tears | ABO blood group system | Polycomb-group proteins | Blood Meridian | Tekken: Blood Vengeance | Hitman: Blood Money | Blood transfusion | Blood Red Shoes | Blood Oranges | Blood Brothers | Trithorax-group proteins | Rambo: First Blood Part II | National Heart, Lung, and Blood Institute | Canadian Blood Services | Blood Sugar Sex Magik | blood plasma | Blood donation | Blood Brothers (musical) | There Will Be Blood | The Family of Blood | Survivor: Blood vs. Water | Surfer Blood | Spartacus: Blood and Sand | James Blood Ulmer |
Prior to the 1952 confirmation of DNA as the hereditary material by Alfred Hershey and Martha Chase, scientists used blood proteins to study human genetic variation.