The Helicobacter hepaticus hefA gene is involved in resistance to amoxicillin.
Belzer C, Stoof J, Breijer S, Kusters JG, Kuipers EJ, van Vliet AH. The Helicobacter hepaticus hefA gene is involved in resistance to amoxicillin. Helicobacter. 2009 Feb; 14(1):72-9.