In the Animals and housing subsection of the Materials and methods, there is an error in the sixteenth sentence of the first paragraph. The correct sentence is: After parturition, on post-partum day 1 (PPD 1), the size of litters with more than six puppies was adjusted by removing extra puppies by random selection to yield six puppies; the removed puppies were euthanized by intracardiac injection of sodium pentobarbital solution at 240 mg/mL and dose volume based on the standard operating procedures of the testing facility.