SFTPA1 and infection: However, there is a significantly higher correlation between mRNA and protein level for genes that are differentially expressed (116), and we speculate that the mRNA levels of the differentially expressed genes studied here correlate in most (if not all) cases with protein levels, (b) the molecular mechanisms of the identified pathways were not studied, and (c) though the level of SP-A1 and SP-A2 is similar in single gene variants (Figure 1), we did not study the impact of varying amount of SP-A1 and SP-A2 on AM gene expression in response to infection.