Though research on repairing damaged brains has provided many exciting and encouraging results,these advanced techniques,such as the ones that utilize human fetal tissue,raise many troubling ___________ concerns as well.

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The Answer of Though research on repairing damaged brains has provided many exciting and encouraging results,these advanced techniques,such as the ones that utilize human fetal tissue,raise many troubling ___________ concerns as well.

Though Research on Repairing Damaged Brains Has Provided Many Exciting