the liver does with the medication does it tolerate the drug or is there damage to my colleague johan shawn and then i can also see on the other organ here in the heart liver or pancreas whether these products have an effect whether they can be helpful in healing illness or maybe produce side effects it's all in the. major advantage is that the substances can be tested directly on human cells so in contrast to animal testing the research is can gather reliable evidence about the effects on people. that's because tests on rats and mice can only predict where the substance is a toxic to humans just 43 percent of the time so most medications that were tested successfully on animals fail when drug studies and then conducted on humans up to 95 percent of all drugs trial. these 2 neuroscientists have developed another alternative to animal testing they can simulate on the computer how a medication or substance affects the conduction of stimuli in the brain. the nerve cells in the brain structures that we study are also affected by alzheimer's disease and epilepsy which is why it's important to be