sentences:  The importance of CCR5’s sulfation for HIV invasion has led to research on TPST and CCR5, including a characterization of the pattern of sulfation of CCR5.Beyond these two proteins, other notable protein substrates include Cholecystokinin (CCK), Factor V and Factor VIII, gastrin, the leech enzyme hirudin, fibrinogen, Complement component 4, follicle-stimulating hormone receptor (FSHR), and other chemokine and G-protein coupled receptors.A full, up-to-date list can be found at UniProtKB.