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.
Hereâs why. Collagen is a protein made up from amino acids, including the amino acids proline, glycine, and arginine. In fact, collagen is so important that it makes up approximately 30 percent of all the proteins in the body, and is found all over the bodyâin tendons, ligaments, bones and much more.