Or perhaps they simply emerged as a consequence of other changes in the shape of our head. (newscientist.com)
It protects cells from environmental stresses such as high temperatures or toxins by promoting changes in shape in stress - damaged proteins, restoring them to their working forms. (uchospitals.edu)
That's why for these animals it is important to keep an eye on their bodies in order to notice any subtle changes in their shape. (petfoodtalk.com)