eutherian lineage. Since this evolutionary split, though, UCP1 has evolved independently in eutherians, through a process which scientists believe was not driven by natural selection, but rather by neutral processes like genetic drift.

Evolution of Skeletal-Muscle Non-Shivering Thermogenesis

The second form of NST occurs in skeletal muscle. While eutherians use both BAT and skeletal muscle NST for thermogenesis, birds only use the latter form. This process has also been shown to occur

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