Comment on

• Early transient suppression of immune checkpoint proteins T-cell immunoglobulin mucin-3 and programmed cell death-1 in peripheral blood lymphocytes after blastocyst transfer is associated with successful implantation.

  Zhang T, Zhu W, Zhao Y, Cheung WC, Liu Y, Chen X, Du Y, Leung KT, Chan YL, Wang CC, Laird S, Li TC. Zhang T, et al. Fertil Steril. 2020 Aug;114(2):426-435. doi: 10.1016/j.fertnstert.2019.12.022. Epub 2020 Mar 18. Fertil Steril. 2020. PMID: 32199622