Fig. 7. SP-A gene expression in SP-C/G6en mice. Radioactive in situ hybridization was performed on E17.5 wild-type (A) and SP-C/G6en (B) embryos using a specific antisense riboprobe for SP-A. Note hybridization to distal airway epithelium in both wild-type and transgenic embryos (red arrowheads). Sense probe did not produce a detectable hybridization signal (data not shown). Scale bar: 67.5 µm.