An independent variable is the variable that the scientist changes,  and the dependent variables are the variables that the scientist  doesn't control.
Glycoprotein VI (platelet) also known as GPVI is a glycoprotein receptor for collagen which is expressed in platelets. In humans, glycoprotein VI is encoded by the GPVI gene.
Collagen is the main structural and most abundant protein found in animal connective tissue. It is made up of amino acids and contains specific amino acids like glycine, praline, hydroxyproline and arginine.