A prosthesis is a functional replacement for an amputated or congenitally malformed or missing limb. There is evidence of chemical pollutants causing frog developmental deformities (extra limbs, or malformed eyes). This may cause abnormal assembly leading to malformed viruses. The programmer assumes users will try incorrect, bogus and malformed inputs. Children born with structural defects may have malformed limbs, heart problems, and facial abnormalities. Alagille syndrome causes bile duct paucity, which is characterized by narrow and malformed bile ducts. Hip dysplasia can range from barely detectable to severely malformed or dislocated. These individuals have malformed eye sockets and foreheads. Though arthrogryposis may be surgically corrected in some cases, most of the malformed animals die. Physical effects of malformed bones vary according to the specific disease. Newfoundlands are prone to hip dysplasia (a malformed ball and socket in the hip joint). This condition is also characterized by absent teeth (hypodontia) or teeth that are malformed. Trees on poorer sites often become malformed and scraggly. The external ear is sometimes small, rotated,malformed, or absent entirely in people with TCS. She is shocked to find that the new hatchlings are weak and malformed.