FIG. 1.

Characterization of albumin-tv-a transgenic mice. (Top) Ethidium bromide-stained agarose gel showing the presence of TVA mRNA in selected tissues in albumin-tv-a transgenic mice, as detected by RT-PCR. Amplification of β-actin mRNA is shown as a control in the lower panel. (Bottom) Identification of proliferating cells in the liver of 2-day-old mice (left) and 6-week-old mice (right) by immunohistochemical staining for the proliferation-associated marker Ki67. Original magnification, ×100.