Editing Endomembrane system (section)

=== Vesicles ===
{{main|Vesicle (biology)}}

[[Vesicle (biology)|Vesicles]] are small membrane-enclosed transport units that can transfer molecules between different compartments. Most vesicles transfer the membranes assembled in the endoplasmic reticulum to the Golgi apparatus, and then from the Golgi apparatus to various locations.<ref name=Lodish2>{{cite web|url=https://www.ncbi.nlm.nih.gov/books/bv.fcgi?highlight=Vesicles&rid=mcb.section.4883#4887|title=Section 17.10 Molecular Mechanisms of Vesicular Traffic|access-date=2008-12-09|last=Lodish|first=Harvey| name-list-style = vanc |year=2000|work= Molecular Cell Biology|publisher=W. H. Freeman and Company|display-authors=etal}}</ref>

There are various types of vesicles each with a different protein configuration. Most are formed from specific regions of membranes. When a vesicle buds off from a membrane it contains specific proteins on its cytosolic surface. Each membrane a vesicle travels to contains a marker on its cytosolic surface. This marker corresponds with the proteins on the vesicle traveling to the membrane. Once the vesicle finds the membrane, they fuse.<ref name=Alberts6>{{cite web|url=https://www.ncbi.nlm.nih.gov/books/bv.fcgi?highlight=vesicles&rid=mboc4.section.2306#2308|title=The Molecular Mechanisms of Membrane Transport and the Maintenance of Compartmental Diversity|access-date=2008-12-09|last=Alberts|first=Walter| name-list-style = vanc |year=2002|work= Molecular Biology of the Cell 4th edition|publisher=Garland Science|display-authors=etal}}</ref>

There are three well known types of vesicles. They are [[clathrin]]-coated, [[COPI]]-coated, and [[COPII]]-coated vesicles. Each performs different functions in the cell. For example, clathrin-coated vesicles transport substances between the Golgi apparatus and the plasma membrane. COPI- and COPII-coated vesicles are frequently used for transportation between the ER and the Golgi apparatus.<ref name=Alberts6 />