G-L - Page 2 Dr. Gina Leisching MusculoskeletalGCGC is a protein which binds to vitamin D allowing for its efficient transport around the body. SleepGRIA3GRIA3 is a glutamate receptor important in neuronal signaling. SleepGAD1GAD1 is an enzyme which catalyzes the formation of the important neurotransmitter GABA. « 1 2