Multiple cargo binding sites on the COPII subunit Sec24p ensure capture of diverse membrane proteins into transport vesicles.
Miller EA, Beilharz TH, Malkus PN, Lee MC, Hamamoto S, Orci L, Schekman R.
Cell. 2003 Aug 22;114(4):497-509. doi: 10.1016/s0092-8674(03)00609-3.PMID: 12941277