in situ Hybridizations Using Digoxigenin-labeled Riboprobes for ATPase 6 (A) and SP-B (B) with Colorimetric Detection. Three micrometer-thick sections of dexamethasone-suppressed non-infected rat lung (NRL) and Pc-infected rat lung (PcIRL) were hybridized with ATPase 6 or SP-B probes. Left-side panels are representative sections probed with sense probes (S). Right-side panels show representative sections probed with anti-sense probes (AS). Arrows indicate cells that show the blue precipitate (indicating ATPase 6 expression) in the section of NRL probed with AS probe.