text: In membranes from HEK293 cells transfected with alpha2-receptors, etomidate inhibited binding of the alpha2-antagonist, << [3H]RX821002 >>, with higher potency from alpha2B- and alpha2C-receptors than from [[ alpha2A-receptors ]] (Ki alpha2A 208 microm, alpha2B 26 microm, alpha2C 56 microm).