when naf , snf2 , nh4f , csf , ( ch3 ) 4nf , and na2po3f were used as sources of f- ( adjusted to 10 ppm of f- in all cases ) , the proteins bound 2.1 , 1.8 , 1.6 , 1.4 , and 0.3 ppm of f- per mg of protein , respectively .
C0037508
naf
C0016327
f