sentence: To test this sbh1 Δ sbh2 Δ leu2-3 ,112 ura3-52 trp1 Δ cells were transformed with reporter plasmids encoding invertase or dipeptidyl aminopeptidase B ( Dap2 ) signal sequence and 23 ( Suc2 ) , 277 ( Suc2 ) or 300 ( Dap2 ) first amino acids , respectively , before the ubiquitin moiety and Ura3p .