OAS1 and infection: LTR16B2:ERVL and MER74A:ERVL were significantly upregulated under infection (Supplementary Figures S3A, B), and showed positive correlation with the expression of OAS1 (Supplementary Figures S3B, C), whereas CapAeg_1.233:ERVK was specifically upregulated in embryos (Figure 5A) and also showed positive correlation with OAS1 (Figures 5B, C).