不过怀疑者声称这种结构不过是被撕碎的胶原纤维，而中华龙鸟有着光滑的爬行动物的皮肤。
Skeptics have claimed that the structures were just shredded collagen fibers and that Sinosauropteryx had a smooth reptilian skin.
他和其他人还指出，晒太阳会通过破坏深层胶原纤维和产生皮肤松垂与皱纹加速衰老过程。
He and others also pointed out that sun exposure hastens the aging process, by damaging deeper collagen fibers and creating sagging and wrinkles.
皮肤的组织学检查发现包括平坦的真皮-表皮交界，变薄的真皮有著紧密排列的胶原纤维，及发育不全的附属器构造。
Histological findings of the skin include flat dermal-epidermal junction thinned dermis with compactly arranged collagen fibers and hypoplastic appendage structures.
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