1.   Then they were divided into various groups and given unlimited normal rat food and water for the next seven days.

2.   Each group received normal rat chow.

3.   He found that the offspring had larger testicles and produced more sperm than normal rats.

4.   Rats that overproduced neuropeptide Y drank less alcohol than normal rats, while animals without any neuropeptide Y drank more than usual.

5.   That worked both in rats that had their ovaries removed and normal female rats.

6.   Out of ten mice implanted with rat cells, three produced normal rat sperm, the scientist said.