One in five has a mutation that provides superior resilience to cold

Almost one in five people lacks the protein alpha-actinin-3 in their muscle fiber. Researchers now show that more of the skeletal muscle of these individuals comprises slow-twitch muscle fibers, which are more durable and energy-efficient and provide better tolerance to low temperatures than fast-twitch muscle fibers.

from Top Health News -- ScienceDaily https://ift.tt/2Zq55H4