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 a major component of the extracellular matrix in both the basal lamina and connective tissue. Chief protein in bone, tendon, and skin. Constitutes 25% of the total protein mass in the body. Three polypeptides wound around one another to form a super helix.