The IL15RA gene is linked to lean body mass and muscle size (hypertrophy). One version is associated with muscle size and the other is linked to muscle strength in response to resistance-type training.

Global population distribution:

Source: 1000 Genome Project. Global averages for both sexes

Global population distribution:

Source: 1000 Genome Project. Global averages for both sexes

IL15RA: AA

21%

IL15RA: CA

44%

IL15RA: CC

35%

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