YTHDF2 and dystocia: Supporting this hypothesis is the fact that 92% (23 out of 25) of the associations involving P1 are related to effects significantly governed by the cross-talk between the P1 dam and the dF2 conceptus, including pre-implantation loss, post-implantation loss, increased gestation length (indicating delayed birth), and dystocia (problems during delivery) (Table S3 of the Supplementary Information).