Environmentally-acquired bacteria influence microbial diversity and natural innate immune responses at gut surfaces.
Mulder IE, Schmidt B, Stokes CR, Lewis M, Bailey M, Aminov RI, Prosser JI, Gill BP, Pluske JR, Mayer CD, et al. BMC Biol. 2009 Nov 20; 7:79. Epub 2009 Nov 20.