Among the six studies on PD, it was found that two of the studiesdid not specify whether the ghrelin used was AG or a mixed solutionof AG and UAG., While Bayliss, Lemus used both AG and UAG, Elabi et al. studied the effect of AG in two doses (10 and50 μg/kg) as well as the ghrelin receptor agonist JMV-2894 onE14 ventral mesencephalon graft in PD rats. The gene discussed is GHRL; the disease is Parkinson disease.