The phrase "rat hearts" refers to the hearts of rats, which are small mammals. It could symbolize the idea of studying or examining these organs for scientific or medical purposes. Full definition
To mimic the energy starvation of heart muscle during a heart attack, the researchers created a «heart attack in a dish» by covering a thin layer of rat heart cells with glass to cut off the supply of oxygen and nutrients. (sciencedaily.com)
Researchers report in tomorrow's issue of Science that they've created thin films that are hybrids of rat heart muscle cells grown on a prepatterned plastic support. (sciencemag.org)
Now father's and daughter's obsessions have combined in an unlikely creation: a nickel - sized artificial stingray whose swimming is guided by light and powered by rat heart muscle cells. (science.sciencemag.org)