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RE: origins of endothermy
<You probably know, then, of tent bats which "decouple" their
< phospholipids to increase body heat. Such leakage has even been
< tried as a diet method. But don't try it at home.
If you are talking about uncoupling proteins (poteins that decouple
oxidative phosphorylation from ionic transport), Mickey and I had a discussion
about that not long ago. Neither of us are exactly certain precisely what part
these play in endothermic relative to ectothermic animals. I don't know if
endotherms make more regular use of decoupling proteins so as to avoid
producing a wasteful excess of ATP in the process of producing heat or not.