Other heart birth defects include ventricular septal defect, pulmonary atresia, and tetralogy of Fallot. Tetralogy of Fallot results in low oxygenation of blood. Infants and children with unrepaired tetralogy of Fallot may develop "tet spells". Tetralogy of Fallot (TOF) is a type of heart defect present at birth. Mortality rate depends on the severity of the tetralogy of Fallot. There is anatomic variation between the hearts of individuals with tetralogy of Fallot. Older children will often squat during a Tetralogy of Fallot "tet spell". It is one of the four findings in the classic tetralogy of Fallot. In case of a duplication of GJA5 tetralogy of Fallot is more common. Another unusual 2001 adaptation of the tetralogy was entitled "Shakespeare's Rugby Wars". The Japanese printings of the tetralogy and coda were illustrated by Yoshitaka Amano. His most famous work is "The Alexandria Quartet," a tetralogy published between 1957 and 1960. In the later tetralogy Shakespeare clearly inclines towards the Lancaster myth. Such format is called a continuous tragic tetralogy. The oldest manuscript for the seventh tetralogy is Codex Vindobonensis 54.