Insufficient funds <a href=" http://www.bakken-young.com/index.php/seroquel-2-5-mg.pdf#continuous ">is seroquel xr used for sleep</a> In the study, researchers were able to coax the mice' immune system to accept the new islet cells. They found that the rat islet cells produced insulin in rats for about 300 days. Interestingly, the procedure didn't involve suppression of the immune system via drugs, which is known to cause other side-effects.