... L2 by OAB. (A) Double reciprocal plots of inhibi-tion by 0 lM (e), 3 lM ( ), 10 lM ( ), 15 lM (·) and 20 lM( ) OAB. (B) The region indicating competitive inhibition wasanalyzed further by ... L2 by NATA. (A) Double reciprocal plots of inhibition of L1 by 0 lM (e), 105 lM (h), 135 lM (D), 270 lM ( ),405 lM ( ) and 540 lM ( ) NATA. (B) Double reciprocal plots of inhibition of L2 by ... L2 by NATA with initial competitiveinhibition suggests that NATA binds at two differentsites, of which the substrate-binding site has higheraffinity.Inhibition by NATInhibition of L1by...