passages.id: split_1_test_984_passage
passages.type: progene_text
passages.text: Gene fusions include : (i) carboxyl - terminal - tagged bacterio - opsin ; (ii) a carboxyl - terminal fusion with the catalytic subunit of the Escherichia coli aspartate transcarbamylase ; (iii) the human muscarinic receptor , subtype M1 ; (iv) the human serotonin receptor , type 5HT2c ; and (v) the yeast alpha mating factor receptor , Ste2 .