1.   Even sperm might be adversely affected, a rat study indicated.

2.   Now, a rat study has raised the possibility that the radiation might adversely affect learning and memory.

3.   One leading critic of this research said the new rat study raises even more questions about administering ketamine to induce psychotic symptoms in people.

4.   Rat studies indicate that one isoflavone found in soy can block the growth-stimulating effects of estrogen in the breast.

5.   Therefore, Cohen says, the rat studies have no bearing on people.

6.   The rat study suggests that lead taken in by a mother can later make her child unusually vulnerable to cavities.

7.   The rat study was published in the March issue of the journal Nature Medicine.

8.   They noted that the rat studies were limited to two cancer cell lines, one of which has not proved a good model for human disease.

9.   Those include lab experiments, rat studies, observations of large groups of people and human experiments.