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One way tumors fly under the radar of the immune system is by using IDO, an enzyme used by fetuses to help avoid rejection, to recruit powerful regulatory T cells that turn down the immune response, researchers say.

(SACRAMENTO, Calif.) - Osteoporosis affects many women and can cause painful, disabling and even life-threatening fractures. Researchers from the UC Davis Department of Internal Medicine are seeking a simple, inexpensive way to prevent the disease. Strontium citrate is a widely available, over-the-counter dietary supplement promoted to "improve bone health." Strontium is a natural element found in bone in all people. Strontium citrate is another form of strontium ranelate, a proven medication prescribed across Europe and Australia to treat and prevent osteoporosis and related fractures. Unlike pharmaceuticals, strontium citrate is not a prescribed medication and is inexpensive.