George Wallace Kidder

December 9^th

• American biochemist who demonstrated that a chemical distinction exists between tumorous and normal cells.
• He was a protozoologist for a number of years in his early career.
• His study of tetrahymena, a one-cell, pond ciliate with a basic biochemical pattern in most respects resembling that of human cells, led to his discoveries in abnormal growths and, ultimately, in cancerous cells.