The researchers said the rat lines that got the human genes but did not get sick may be analogous to these people.

The route, which the general called "a rat line," provided "a way that guys got in and out" of Iraq over the Syrian border.

American military officials have said there is "a rat line" of insurgents flowing north.

While his official status was minor, Hudal clearly played a role in the rat line.

Freshmen experience a grueling yearlong initiation called the "rat line," in which upperclassmen order them to perform rigorous physical exercises and two-mile runs.

Insurgents have had a network of illegal "rat lines" of men and materials moving from Syria into Iraq that had to be interdicted, he said.

The objective is to totally disrupt the safe havens and rat lines that have allowed them to bring those materials across the border.

They cited the male bonding of the freshmen, whom they call the "rat line."

"With women, the rat line would be no more," said Chad Correll, a senior from Roanoke.

Your article about Ms. La Roche illustrates that such exclusion is not limited to the "rat line."