An international team of scientists has mapped a molecular complex that could aid in the development of better medications with fewer side effects for osteoporosis and cancer. The near-atomic resolution images depict parathyroid hormone receptor-1 (PTH1R), a molecule that conveys signals to and from cells, interacting with two key messengers — a molecule that mimics parathyroid hormone, one of the most important regulators of calcium levels in the body, and a stimulatory G protein, a molecule that mediates bone turnover.