ACE2 and COVID-19: Although further studies are warranted, the fact that (1) ACE2 and TMPRSS2 are coexpressed on cells in the maternal–fetal interface and the epiblast and that (2) CD147 and CTSL are coexpressed in the majority of embryonic cells suggests that it is advisable to avoid pregnancy during this pandemic due to the potential for maternal–fetal transmission of COVID-19.