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Re: ABSRD BAND on Sinornithosaurus feathers
David Marjanovic wrote:
<< There is an even simpler, IMHO even more obvious, solution: just about any
shape is perfect for getting rid of excess sulphur-rich protein, >>
This concept keeps cropping up so, and at the risk of offending: It is, and
always was, bulls**t. Sulfur has several major ways out of the body, at
absolutely trivial energy expense (urine, feces -- see what I mean about
bulls**t?) To evolve an epidermal structure of great complexity (even hair,
let alone feathers) is a tremendous waste of body resources, when the kidney
and liver were already there and dealing with sulfur levels -- and N and P
and Se and Ni and K and Ca and H . . .
What's a little S, more or less, to such a dynamic system?
A question: if variations in your sulfur-wearing protobird's diet led to
normal or deficient sulfur levels, did it stop growing feathers?
Thomas P. Hopp, PhD Biochemistry 1977, Cornell Medical College