id	keyword
mkg-22233	group
mkg-22233	bone
mkg-22233	collagen
mkg-22233	type
mkg-22233	propolis
mkg-22233	day
mkg-22233	expression
mkg-22233	cha
mkg-22233	periodontitis
mkg-22233	ofd
mkg-22233	rabbits
mkg-22233	study