The awn coils under dehydration and uncoils when wet. It is made of the brown hairs that cover the young fiddlehead as it uncoils. HlyD which uncoils and moves to the outer cell membrane. This structure, which is unique to haptophytes, coils and uncoils in response to environmental stimuli. From studies it appears that VWF uncoils under these circumstances, decelerating passing platelets. He maintains this position for a second at most and then uncoils himself before landing.