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Pulm Surfactant Lipids in Host Defence Against Respiratory Viral Infect:surfactant-lipoprotein complex of lung,90% lipid,10% protein,alv type2(ATII)cell;(SP)-A,SP-B,SP-C,SP-D.SP-B SP-C:small hydrophobic peptides.SP-A,SP-D:large,soluble,hydrophilic protein