A novel bioassay for detection of preimplantation factor (PIF).


PROBLEM To identify the presence of vital preimplantation embryos in vivo in humans, a newly observed phenomenon based on autorosette formation between lymphocytes and platelets, when treated with pregnant sera, was used as a marker. METHOD Serum samples were obtained from 65 patients on the fourth day after embryo transfer (ET). Sera from 10 healthy… (More)


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