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Re: Ptero fuzz distribution?

The following sentence is a speculation. It is possible that the structures
are remnants of a disintegrating support structure for the actinofibrils, a
mechanism for controlling or distributing the forces acting upon the
actinofibrils between the actinofibrils. If so, the structures could be
used to modulate and/or redirect the load paths in the membrane

Wasn't it recently shown (and mentioned onlist, though I forgot all information on how to find this) that the "actinofibrils" were good old muscle fibers instead of stiff supports (making pterosaur wings a lot more similar to bat wings)?