porous hydroxyapatite ( ha-p ) discs ( 5 mm in diameter ; 1.5 mm thick ; porosity , 80 % ; mean pore size , 200 micron ) were impregnated with purified bovine skin collagen ( 1 mg/disc ) and a small amount of semipurified bone morphogenetic protein ( bmp ) of sarcoma origin ( 100 micrograms/disc ) and implanted into dorsal muscles of ddy mice .
C0009325
collagen
C0026559
morphogenetic