AUSTIN, Texas (AP) — The experimental stem cell procedure that Texas Gov. Rick Perry underwent this summer could be restricted or even blocked under new rules being considered Friday by the state's Medical Board.

Some top scientists are questioning the safety and wisdom of the procedure, and doctors say it may run up against federal rules. It also carries potential health threats, ranging from blood clots to increased cancer risk.

The Republican presidential candidate had stem cells taken from fat in his own body, which were then grown in a lab. They were injected into his back and his bloodstream during an operation in July to fuse part of his spine.

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