Pectoralis Muscle Fiber Diameter and Myonuclear Domain Remain Unchanged in Winter-Phenotype House Sparrows (Passer domesticus) Acclimated to Stable Warm, Stable Cold, and Fluctuating Cold Thermal Treatments.

AbstractPhenotypic flexibility can allow for reversible changes in adult phenotypes according to prevailing environmental conditions, a concept referred to as environmental matching. Increasing thermal variability across seasons is one of the predict…

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