PTH Protein or parathyroid hormone raises calcium levels by dissolving bone salts and inhibiting kidney excretion It also stimulates [1-14C]-2-deoxy-D-glucose transport and glycogen synthesis in osteoblastic cells interacting with the PTH1R receptor and binding to its N-terminal extracellular domain for these effects PTH Protein Human (GST) is the recombinant human-derived PTH protein expressed by E coli with N-GST labeled tag