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    Science and society: in the sixteenth and seventeenth centuries

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    eIF2α phosphorylation in hepatocytes is dispensable for survival of adult mice. (a) Diagram depicting the four genotypes of mice used in these experiments. S/A and A/A represent heterozygous and homozygous eIF2α Ser51Ala (*) mutation(s) in exon 2 of one eIF2α allele and both eIF2α alleles, respectively. fTg/0 represents the floxed wild type (WT) eIF2α transgene driven by the CMV enhancer and chicken β-actin promoter (Enh-Pro). The loxP sequences (black arrowheads) allow excision of the WT eIF2α floxed transgene (fTg) and expression of EGFP, an indicator of recombination. CRE Hep /0 represents the Cre recombinase transgene driven by the promoter (Alfp) of Alb1 (encoding albumin) and the enhancer of Afp (encoding alpha-fetoprotein). (b) Efficiency of deletion of the fTg in liver tissues. Results from quantitative RT-PCR analyses of transgenic and total eIF2α mRNAs are shown. Data are means ± SEM (n = 4 ~ 5 mice per group); ### p < 0.001; Cont. vs A/A Hep . (c) Western blot analysis of eIF2α protein expression driven by the fTg in liver tissues. To quantity expression of eIF2α, blots were incubated with anti-eIF2α antibody followed by IRDye-800 goat anti-rabbit IgG (LI-COR). Membranes were scanned on an Odyssey scanner (LI-COR) (lower two panels in left panels) and quantified with the Odyssey Software package. (d) Western blot analysis of liver lysates in Cont. and A/A Hep mice at the indicated times after Tm injection. Cont. mice and A/A Liv mice were injected with vehicle or tunicamycin (Tm, 1 mg/kg). (e) Body weight measurements of fTg -deleted A/A Liv mice. At the weeks, body weight was measured in both male and female mice. Data are means ± SEM (n = 6-14 mice per group). (PDF 1987 kb