| In this study , we visualize the intracellular trafficking of beta arrestin 2 in response to activation of several distinct GPCRs including the beta 2 adrenergic receptor ( beta2AR ) , angiotensin 2 type 1A receptor ( AT1AR ) , dopamine D1A receptor ( D1AR ) , endothelin type A receptor ( ETAR ) , and neurotensin receptor ( NTR ) . ^^^ |