Effects of dietary Se and vitamin E concentrations on relative mRNA abundance of (A) GPX1, (B) GPX3, (C) GPX4, (D) MsrB1, (E) SELENOF, (F) SELENOH, (G) SELENOM, (H) SELENON, (I) SELENOP, (J) SELENOU, (K) SELENOW, (L) SELENOT, (M) SELENOO, (N) SELENOK, and (O) TXNRD1 in the chick pancreas on days 14, 18, and 28. Data are means ± SE, n = 5. Values within a given time differ (P < 0.05) without sharing a common superscript letter. Abbreviations: Se, selenium deficient; +Se, selenium adequate; –Vit. E, vitamin E deficient; +Vit. E, vitamin E adequate; GPX1, glutathione peroxidase 1; GPX3, glutathione peroxidase 3; GPX4, glutathione peroxidase 4; MsrB1, selenoprotein R; SELENOF, selenoprotein F; SELENOH, selenoprotein H; SELENOM, selenoprotein M; SELENON, selenoprotein N; SELENOP, selenoprotein P; SELENOU, selenoprotein U; SELENOW, selenoprotein W; SELENOT, selenoprotein T; SELENOO, selenoprotein O; SELENOK, selenoprotein K, and TXNRD1, Thioredoxin reductase 1.