Like most cancers, it is thought to begin in a single cell, with a mutation that is not present at birth but that occurs later for some unknown reason.
我们认为该病与大多数癌症一样，是起源于单个细胞突变，但这种突变并不是先天的，而是发生于后天，但原因不明确。
Methods The level of expression of CD44 in 41 unknown reason infertility and 35 normal endometrium was measured by immunohistochemical method (S-P technique).
方法：采用免疫组化s - P法检测41例不明原因不孕症及35例正常宫内膜组织中CD 44的表达水平及分布。
The patient of convulsion with unknown reason, and no fever, should be checked the blood-lead for early diagnosis in order to prevent from leaking diagnosis.
对不明原因的无热惊厥者应注意及时行血铅检查，以便早期诊断，防止漏诊。
Kawasaki disease is now a major reason for acquired heart disease in children, but its etiology and pathophysiological mechanism are unknown.
川崎病是目前儿童后天性心脏病的主要病因之一，但是其病因不明，临床研究其发病机制存在诸多限制。
Kawasaki disease is now a major reason for acquired heart disease in children, but its etiology and pathophysiological mechanism are unknown.
川崎病是目前儿童后天性心脏病的主要病因之一，但是其病因不明，临床研究其发病机制存在诸多限制。
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