What Have We Learned From the Use of Animals in Scientific Research?

To the Editor:

In "Lives in the Balance" (The Chronicle Review, January 26), Seth Perry fails to tell readers where animal dealers such as his parents obtain the cats and dogs they sell to laboratories, to be force-fed poisons, addicted to chemicals, infected with diseases, and subjected to invasive surgeries.

According to the U.S. Department of Agriculture, animals can come from "random sources." This includes the local animal shelter, "free to a good home" ads, and possibly

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