设阳性及阴性对照组。
结果：胎盘郎汉斯细胞及合体细胞呈现阳性反应，而阴性对照无反应。
Results:The placental trophoblastic cells had strong positive reactions while the control groups showed negative reactions.
结果心房起搏可诱发所有X综合征患者出现胸痛及ST段压低，而对照组则阴性。
Pacing induced chest pain and ST segment depression were observed in syndrome X, but not in controls.
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