Tamapin TFA is a venom peptide, targeting to small conductance Ca (2+)-activated K(+) (SK) channels. Tamapin TFA is a selctive blocker of SK2 ( Potassium Channel ). Tamapin TFA inhibits SK channel-mediated currents in pyramidal neurons of the hippocampus. Tamapin TFA can be isolated from the Indian red scorpion (Mesobuthus tamulus).