et al "A critical reappraisal of the fossil record of the bilaterian phyla"   Biol Rev Camb Philos Soc. 2000 May;75(2):253-95
†The statements on this Web site have not been evaluated by the Food and Drug Administration (FDA). And are not intended to diagnose, treat, cure or prevent disease. The information presented is not intended to replace medical advice or treatment from your own doctor or healthcare provider. Nothing presented here is intended as a substitute for prescription medication or any other medical treatment prescribed by your doctor.