Peripheral blood samples were layered on Ficoll Hypaque gradients (LymphoprepTM; Alere Technologies, Norway) for density gradient centrifugation (453 × g for 30 min). Mononuclear cells were isolated and washed twice with phosphate-buffered saline (PBS). Decidual tissues were rinsed thoroughly with PBS and minced into 1–2 mm pieces by a pair of scalpel blades in Dulbecco's Modified Eagle Medium. Then, the suspensions were filtered through a 32 μm nylon mesh as reported elsewhere (24 (link)). All samples were cryopreserved until single-cell analysis.
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