Pearse's main contributions lie in the structure of coated vesicles. Pearse first purified coated vesicles; she also discovered the clathrin coat molecule in 1975. Coated pits and vesicles were first seen in thin sections of tissue in the electron microscope by Thomas Roth and Keith Porter in 1964. The importance of them for the clearance of LDL from blood was discovered by R. G. Anderson, Michael S. Brown and Joseph L. Goldstein in 1976.