Rat and human HSCs and myofibroblasts express PGRMC1 in vitro. Left panel, RT-PCR analysis for rPGRMC1 in rat cells and tissues as indicated using primer sequences and conditions as outlined in methods section. T6 cells are a rat hepatic stellate cell line  (a). Right panel, Western blot of the indicated cell types for rPGRMC1 using the anti-IZAb (a). RT-PCR products from the indicated cell types with and without digestion with the restriction enzyme Nci-I as indicated. rPGRMC1 PCR product does not contain an Nci-I site whereas the truncated HC5 variant contains a single site and is cleaved  (b). Left panel, RT-PCR analysis for hPGRMC1 in human cells using primer sequences and conditions as outlined in methods section. Senescent myofibroblasts had ceased proliferation (typically at passage 3–5) (c). Right panel, Western blot of the indicated anonymised donor cells for hPGRMC1 using the anti-IZAb (c). Results typical of a least 3 independent experiments and/or animals except right panel (c), 2 separate human donors.