the rate constant for the inhibition of factor xa by antithrombin iii rose from 2.62 x 10 ( 4 ) m-1 x min-1 in the absence of divalent cations to a maximum of 6.40 x 10 ( 4 ) m-1 x min-1 at 5 mm ca2+ , 8.10 x 10 ( 4 ) m-1 x min-1 at 5 mm mn2+ , with a slight decrease in rate at higher cation concentrations .
C0007448
divalent cations
C0007447
cation