The fixed points, PF2 and PF3, and the limit cycle CL1 show an increase in EGFR and TGFß with a total ABRS equal to 84.6% and can represent the physiologic behavior of the familial biliary atresia [26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42]. The gene discussed is EGFR; the disease is biliary atresia.