Ileum expression of bile acid homeostatic genes (FXR, FGF19) and hormones (FGF19) in preterm piglets after 14 days of treatment with PN plus the following: Intralipid (IL), Intralipid plus vitamin E (ILE), Omegaven (OV), or Omegaven plus phytosterols (PS). Quantitative RT-PCR analysis shows relative transcript levels of FXR and FGF19 mRNA and plasma concentrations of FGF19 as described previously.23 Values are means ± SEM; n = 8–10 pigs/group. Differences between treatment groups were analyzed using ANOVA, Kruskal-Wallis, and Mann-Whitney U tests; *P < .05 vs IL. ANOVA, analysis of variance; FXR, farnesoid X receptor; PN, parenteral nutrition; RT-PCR, real-time polymerase chain reaction; SEM, standard error of the mean.