Fig. 9. Regulation of p38 MAP kinase during liver development and liver regeneration. Liver homogenates were analyzed by Western immunoblotting using primary antibody specific for phosphorylated (active) p38 (P-p38) or total p38. Samples were obtained from fetal rats on E17, E19, or E21. Postnatal samples were obtained 1, 4, 7, and 28 days after birth (P1, P4, P7, P28). Additional samples were obtained at various times after partial hepatectomy (PH) or sham operation (S).