caveola

https://doi.org/10.1351/goldbook.12991
Invagination on the cell surface (plasma membrane), enriched in caveolin proteins, cholesterol, and glycosphingolipids, important in various processes including pinocytosis and signal transduction.
Note: A type of lipid raft.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1141 [Terms] [Paper]