id	keyword
mkg-15789	irradiation
mkg-15789	laser
mkg-15789	cells
mkg-15789	proliferation
mkg-15789	viability
mkg-15789	group
mkg-15789	diode
mkg-15789	periodontal
mkg-15789	second
mkg-15789	hpdlf
mkg-15789	medium