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6 King A, Birkby C Loke YW. Early human decidual cells exhibit NK activity against the K562 cell line but not against first trimester trophoblast . Cell Immunol， 1989,118:337. 中国病理生理杂志1999年第7期第15卷论著作者：侯倩王自能曾耀英单位：侯倩王自能暨南大学医学院妇产科（广州510632）；曾耀英暨南大学组织移植与免疫中心关键词：蜕膜；杀伤细胞；天然；雌激素类；孕酮...
First trimester trophoblasts 滋养层细胞
OBJECTIVE To study the imprinting status of H19 gene in normal villi tissue during the first trimester,and its relation to the invasion of trophoblast. 目的检测早孕绒毛组织中印迹基因H19印迹的状态,探讨其印迹状态与滋养细胞浸润能力之间的联系。
Some women experience morning sickness during the first trimester of pregnancy. 有些妇女在怀孕的头三个月里,早上有恶心感。
Objective To prepare highly purified human trophoblast cells from human placentae at the first trimester of normal pregnancy. 目的建立人早孕绒毛滋养层细胞有效的分离、培养方法。
The first trimester of pregnancy. 妊娠的头三个月
The invasiveness of trophoblast derived from first trimester pregnancy can be inhibited by decidual cell conditioned media (DCM),while the mechanism is not very clear. 先前研究表明，蜕膜细胞条件培养液(decidual cell conditioned media，DCM)能够阻止早孕滋养细胞的侵入，然而其具体机制尚未阐明。
Trophoblast derived from first trimester pregnancy expressed MMP-2,MMP-9,TIMP-1 and uPA,but not TIMP-2,PA I-1.The first trimester and term DCM down-regulated the expression level of MMP-2,MMP-9,uPA and up-regulated theexpression level of TIMP-1,PAI-1. 早孕和晚孕DCM均能下调早孕滋养细胞MMP-2、MMP-9、uPAmRNA的表达，而上调TIMP-1mRNA的表达。早孕、晚孕DCM均能诱导滋养细胞PAI-1mRNA的表达，但对TIMP-2mRNA的表达未见有影响。
This is a 33-year-old, primigraida, with a normal first trimester screening. 患者，33岁，初产妇，早期妊娠时检查未看到异常。
First trimester ultrasound: a practical approach.In: McGahan J, Porto M, eds.Diagnostic obstetrical ultrasound. 早期妊娠通过左卵巢的经阴道超声冠状切面，显示黄体囊肿4.;5cm(光标示)。
No data have been published on first trimester teratogenic risk with ondansetron. 没有研究表明在妊娠早期使用恩丹西酮有致畸风险。
On the contrary NO donor may help to terminate of pregnancy in the first trimester. 反之，如使用NO供体则有助于终止妊娠。
Any fever-related illness during the first trimester of pregnancy may carry a two-fold higher risk of offspring with heart defects," the statement said. 这项申明说，“何发烧的疾病在怀孕的前三个月都有可能使婴儿具有双倍患心脏疾病的高风险”。
Any feer-related illness during the first trimester of pregnancy may carry a two-fold higher risk of offspring with heart defects," the statement said. 这项申明说，“何发烧的疾病在怀孕的前三个月都有可能使婴儿具有双倍患心脏疾病的高风险”。
Methods Immunohistochemicl method was used to detect the expression of LN and LN-R in human villi during the first trimester and choriocarcinoma. 方法采用免疫组织化学的方法，观察正常早期妊娠绒毛和绒癌组织中LN、LN-R的表达。
Risk factors for first trimester miscarriage ?results from a UK-population-based case-control study. 2007 N Maconochie, P Doyle, S Prior, R Simmons. 怀孕前三个月流产的风险因素来自于英国人群病例对照研究。
Virus infection：In the first trimester of pregnancy (especially, the first two months), rubella virus infection can produce a harelip infant. 病毒感染：在妊娠早期(2个月内)，如遇风疹病毒感染，可能成为婴儿唇腭裂的原因。
Methods By immunohistochemical method the expression of HB-EGF was observed in 18 cases of human first trimester villi and decidua. 评估HB-EGF在人类胚泡着床和早期胎盘组织发育中的作用。
Conclusions: （1）The proportion of CD56+ NK cells was higher in the first trimester which can indicate the miscarriage of URSA patients. 结论：（1）妊娠早期外周血CD56+ NK细胞比例增高预示URSA的发病机率增加；
Radiation：If the pregnant woman is exposed under radiation in the first trimester of pregnancy, the embryo has a chance to suffer harelip. 放射线：妊娠早期如果接触放射线，则有可能导致胎儿唇裂腭裂。