One in the eye.
A double insight into visual accommodation by the eye lens in birds and into the activity of a superfamily of metabolic enzymes is provided by the structure of turkey lens delta-crystallin.
Riddihough
G
G
D000065:Accommodation, Ocular; D000818:Animals; D005075:Biological Evolution; D003459:Crystallins / Q000737:chemistry*; D007908:Lens, Crystalline / Q000502:physiology*; D011487:Protein Conformation; D014422:Turkeys
D003459:Crystallins