The two studies being published today are very similar to one another, except that they involved different strains of mice.

To create these strains of mice, scientists start at the beginning, with an egg cell.

These are strains of mice in which a single gene has been deleted.

But there is a mutant strain of mice that have hearts on the right.

Depending on the strain of mice being used different carcinomas were shown.

The mouse strain is sold to laboratories as a particularly useful model for studying certain forms of human cancer.

The technical problems are serious because this is different from using genetic engineering to create new strains of mice and other creatures.

In this model, a specific mouse strain is found to voluntarily drink to the levels of intoxication.

For example, there are strains of mice that are deaf.

Similar results have been found in studies involving different strains of rats, mice, and hamsters.