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SP-D mRNA expression in the treatment groups. The levels of expression were increased in the PIV3, PIV3/Ad, and PIV3/Ad/HBD6 groups compared to those in the control group, with a moderate increase in the PIV3/Ad/HBD6 group compared to that for the PIV3/Ad group *, P < 0.05 compared with the results for the control group.
