Musculoskeletal MusculoskeletalFGFR2FGFR2 is a receptor protein which binds fibroblast growth factor, which typically promotes cell division and differentiation. MusculoskeletalATP2B1ATP2B1 is membrane protein which plays an important role in maintaining the cellular calcium balance. MusculoskeletalGCGC is a protein which binds to vitamin D allowing for its efficient transport around the body. MusculoskeletalCYP2R1CYP2R1 is an enzyme expressed in the liver that converts dietary vitamin D into a form which can be transported around the body. MusculoskeletalVDRVDR is the receptor for vitamin D, its main function is to regulate calcium uptake from the gut into the bloodstream.