HEME
Set to 2 different clues across 5 published puzzles, most often “Blood pigment” — The New York Times, Friday, 12 January 2001.
4 letters
Every clue on record, most used first
- Blood pigment4 times
The New York Times — Friday, 12 January 2001
- Myoglobin componentonce
The New York Times — Friday, 16 July 2010