Question: What nationality was the collaborator of Owen Chamberlain in the work for which he received his Nobel prize ?
Sentence (from "Ray David Owen"): Ray David Owen (October 30, 1915 – September 21, 2014) was a teacher and scientist whose discovery of unusual, “mixed,” red blood cell types in cattle twins in 1945 launched the fields of modern immunology and organ transplantation.
Relevant evidence: No