SCD and viral infectious disease: Of note, among the positive correlates to IFNA2 levels in the fatty acid compartment, we observed only saturated (octanoic, dodecanoic, hexadecanoic, octadecanoic) or monounsaturated fatty acids (tetradecenoic, hexadecenoic, octadecenoic) (compare IFNA2 to IFNB1 in SI Appendix, Fig. S10F), suggestive of limited fatty acid desaturase activation despite the stress induced by the viral infection (35).