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Inhibitory role of ALK1 peptide on downstream ID1 signaling molecules in HCV-infected cells. Phosphorylation status of SMAD1/5 and ID1 (A) and anti-apoptotic protein Bcl2 and stem cell-associated proteins Notch1 and Hes1 (B) was inhibited by ALK1 peptide. Densitometric scanning for comparison of protein status is shown on the right. Statistical significance was analyzed using the two-tailed Student t test: *, P < 0.05; **P < 0.01.
