HMGA2 and polycystic ovary syndrome: As demonstrated in human placentas, the HMGA2 expression is crucial to trophoblast invasion in early pregnancy.[38] Moreover, of the genes significantly associated with PCOS in a transcriptome‐wide association study of 48 postmortem tissues,[39] only four were expressed in our mouse PCOS placenta, and they are not differentially expressed (Figure S2d, Supporting Information).