STOCKHOLM (AP) — This year's Nobel Prize recipients will be revealed starting Monday with the prize for medicine or physiology.

The Nobel Assembly of the Karolinska Institute — 50 professors at the Stockholm facility — chooses the winner or winners of the prize honoring research into the microscopic mechanisms of life and ways to fend off invaders that cut it short. A maximum of three laureates are selected.

Last year's prize went to three Americans for work in identifying genes and proteins that work in the body's biological clock, which affects functions such as sleep patterns, blood pressure and eating habits.

The physics prize is to be announced Tuesday, followed by chemistry. The winner of the Nobel Peace Prize will be named Friday. No literature prize is being given this year.