Fig. 7. Influence of D-cycloserine (168.3 µM and 336.6 µM) and cerebrolysin (1.25 µl and 2.5 µl; 1 ml of water contains 215.2 mg cerebrolysin) on KAT I and KAT II activity in human saliva. KATs in saliva without drugs are expressed as 100%. The concentration of cerebrolysin used is described in the Materials and Methods. Six saliva samples were used. **p<0.01 and ***p<0.001 (Student's t-test).