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.
Threonine is an essential amino acid for collagen production. Collagen is an important building block for the skin. It makes up to 30% of the protein of the living body and 70% of the protein that makes up skin. Collagen ensues the cohesion, elasticity and regeneration of skin.he intake of collagen ensures the cohesion, elasticity and regeneration of skin, hair, tendon, cartilage, bones and joints. Collagen is a protein made up of amino-acids: glycine, proline, hydroxyproline, and arginine.