Fig. (1) Gelatinolytic activities in cell supernatants of the growth media of P. gingivalis (P.g.), P. intermedia (P.i.), P. micros (P.m.), P. nigrescens (P.n.), F. nucleatum (F.n.) and A. actinomycetemcomitans (A.a.) were studied with zymographic method. The gelatinolytic activities at 103-107 kDa produced by five serotypes of A.a (a, b, c, d, e) are indicated by arrow..