seventeen of sixty distal extremities of the thoracic aortas of 12-week-old control male turkeys and 37 of 40 distal extremities of the aortas of turkeys fed 0.07 % beta-aminopropionitrile ( bapn ) from 4 to 12 weeks of age contained areas of cartilaginous metaplasia when examined by light microscopy .
C1522460
thoracic aortas
C0003483
aortas