Indicate whether each of the following descriptions better applies to COPI- (1), COPII- (2), or clathrin- (3) coated vesicles. Your answer would be a four-digit number composed of digits 1 to 3 only, e. g. 1322. (1) They are uncoated by an hsp70 family protein, which is stimulated by the binding of auxilin.
(2) They keep their coat proteins for a relatively long time, until they dock onto their target membrane.
(3) Their uncoating depends on activation of an ARF-GAP.
(4) Their uncoating depends in part on activation of a Sar1-GAP.