▁▁ ▁This ▁gene ▁enc odes ▁the ▁alpha 2 C ▁sub type , ▁which ▁contains ▁no ▁intr ons ▁in ▁either ▁its ▁coding ▁or ▁un trans l ated ▁sequences . ▁ ▁Lig ands ▁ ▁Ag on ists ▁▁▁ ▁( R )- 3 - N it ro bi phen y line ▁( also ▁weak ▁ant agon ist ▁at ▁α 2 A ▁and ▁α 2 B ) ▁ ▁An tagon ists ▁▁ ▁B MY ▁ 7 3 7 8 ▁( also ▁α 1 D ▁ant agon ist ) ▁ ▁J P - 1 3 0 2 : ▁select ive ▁over ▁α 2 A , ▁α 2 B , ▁α 2 C ▁ ▁N - { 2 - [ 4 -( 2 , 3 - d ih ydro - ben zo [ 1 , 4 ] d io x in - 2 - yl m eth yl )- [ 1 , 4 ] dia ze pan - 1 - yl ] - eth yl }- 2 - phen ox y - nic ot in am ide ▁ ▁Qu et ia pine ▁▁ ▁Ris per id one ▁ ▁S pi ro x atr ine ▁ ▁Y oh imb ine ▁derivatives ▁ 9 ▁and ▁ 1 0 : ▁> 4 3 ▁fol d ▁select ivity ▁over ▁α 2 A , ▁α 2 B ▁and ▁α 1 ▁sub types ▁ ▁See ▁also ▁ ▁Ad r ener g ic ▁re ceptor ▁ ▁References ▁ ▁External ▁links ▁ ▁Further ▁reading ▁▁ ▁Category : Ad r ener g ic ▁re cept ors <0x0A> </s>