Acclimation & testing periods
Vendor C57BL/6J, DBA/2J, FVB/NJ, CBA/J, BALB/cByJ, and (C57BL/6J x DBA/2J)F1 (B6D2F1) were obtained from Janvier, France; SJL/JOrlCrl from Charles River, Germany; DBA/2NHsd from Harlan, Germany; and A/JOlaHsd from Harlan, U.K. Ages10-12 wks at the start of the experiment FeedRodent maintenance diet Ssniff® V1534-3 R/M-H, autoclaved, given ad libitum WaterAcidified with sulfuric acid (pH 3), autoclaved, given ad libitum Housing5 mice/cage (530 cm2) Photoperiod12hr:12hr day-night cycle (day: 6 a.m. to 6 p.m. CET) Temperature22 °C Relative humidity55% (exchange rate: 15-17 room volumes/hr) Health statusSpecific pathogen free (SPF) Regulatory complianceMice were maintained under specific pathogen free conditions and according to the German animal welfare law. All experiments were approved by an external committee according to the German regulations on animal welfare.