STOCKHOLM - The Nobel Prize in the field of physiology or medicine has been awarded to U.S.-based scientists David Julius and Ardem Patapoutian.They were cited for their discovery of receptors for temperature and touch.The winners were announced Monday by Thomas Perlmann, secretary-general of the Nobel Committee.Patrik Ernfors of the Nobel Committee said Julius, 65, used capsaicin, the active component in chili peppers, to identify the nerve sensors that allow the skin to respond to heat.Patapoutian found separate pressure-sensitive sensors in cells that respond to mechanical stimulation, he said.The winners of the 2021 Nobel Prize in Physiology or Medicine David Julius (L) and Ardem Patapoutian are displayed on a screen during a press.