Since 1999, the American opioid epidemic has killed more than half a million people, and the staggering majority have been ...

According to a new study by WashU Medicine researchers, male and female rats with a chronic pain condition release different ...

We purchased a batch of 40 adult Long-Evans male rats (300–350 g body weight) from a laboratory animal supplier for studies on sexual behavior. We kept the males in pairs in shoebox cages in a ...

View Full Profile. Learn about our Editorial Policies. When researchers castrated a male rat, implanted a uterus into the animal, surgically joined its circulation to that of a female rat, and ...

"The study aimed to assess the effects of unpredictable chronic mild stress (UCMS) during prepuberty and adolescence and the propolis supplementation on cognitive functions in adult male rats." ...

Rats successfully distinguished between two varieties of white wine, Riesling and Sauvignon Blanc, in a study led by ...

Rat copulation, Corrigan said, only lasts seconds and most of their attempts don’t result in pregnancy. A male rat tries to mate with as many female rats as possible. Even though brown rats are ...

The city of Somerville announced on Feb. 19 that it is participating in a Rodent Fertility Control Study using Evolve, which ...

Findings suggest that better understanding of how sex hormones interact with chronic pain could lead to new approaches to addressing the opioid epidemic.

The study revealed that acute stress raises levels of 5αR2 -- but not 5αR1 -- in the front region of the brain of male laboratory rats. Female rats, however, showed no such change, highlighting ...

Brain cells (magenta) in the reward center of a rat’s brain release dopamine in response to opioids. According to a new study by WashU Medicine researchers, male and female rats with a chronic pain ...