Amino acid permeases require COPII components and the ER resident membrane protein Shr3p for packaging into transport vesicles in vitro.
Kuehn MJ, Schekman R, Ljungdahl PO.
J Cell Biol. 1996 Nov;135(3):585-95. doi: 10.1083/jcb.135.3.585.PMID: 8909535