COPI acts in both vesicular and tubular transport.
Yang JS, Valente C, Polishchuk RS, Turacchio G, Layre E, Moody DB, Leslie CC, Gelb MH, Brown WJ, Corda D, Luini A, Hsu VW. COPI acts in both vesicular and tubular transport. Nat Cell Biol. 2011 Jul 03; 13(8):996-1003.