Which of the following is NOT an example of transport that involves sorting signals directing proteins to specific transport vesicles?
1) All of these are examples of transport involving sorting signals
2) Soluble lysosomal enzymes incorporated into clathrin-coated vesicles
3) LDL receptors of the plasma membrane incorporated into clathrin-coated vesicles
4) ER-resident soluble proteins incorporated into COPI vesicles



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