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Protection of cytotrophoblasts from maternal uterine NK lysis in allogenic combinations. Cytotoxicity tests were carried out using the Percoll gradient-purified (A) T146 and (B) T138 cytotrophoblasts as targets and the indicated UBMC from different mothers as effector cells at a 25:1 E/T ratio. The tests were carried out as described in Fig. 2. W6/32, B1.23.2, and IgG2a isotype-matched control antibodies were added to the assay at 10 μg/ml.
