In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

Recently , we demonstrated that platelet - derived growth factor ( PDGF ) - beta receptor stimulation , but not various other growth factors , inhibits transcription of alpha1D - , but not alpha1A - or alpha1B - ARs , resulting in reduced norepinephrine - mediated SMC growth .
alpha1B - ARs