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gestation
AFP expression appears in fetal hepatocytes at four weeks' gestation.
      
It peaks at 16-24 weeks' gestation and decreases gradually afterwards.
      
Fetal hepatocytes at 4-16 weeks' gestation are mainly constituted by HSCs characterized with bi-potential differentiation capacity.
      
At 16 weeks' gestation, most hepatic cord cells begin to differentiate into hepatocytes and abundant HSCs remain in ductal plate (the origin site of Hering canals).
      
The survival rate, physical development, and spontaneous behavior has been evaluated in pups of albino rats exposed to acute hypobaric hypoxia on the 9-10th day of gestation corresponding to the onset of organogenesis.
      
Normal levels of trophoblastic β1 glycoprotein (TBG), a marker of the fetal part of the placenta, and other hormones required for gestation, as well as relationships between them, were studied from the 5th to the 20th week of pregnancy.
      
During gestation, the MPO level decreased in the placental tissues independently of the enzyme location.
      
The mass of silver fox fetuses of both sexes, their gonads, and adrenals, and the levels of testosterone in the blood serum and in gonads and adrenals were determined from day 31 of gestation and every five days thereafter until its termination.
      
No differences were found in the body and adrenal mass in female and male fetuses at all the developmental stages studied, while the mass of ovaries exceeded that of testes from day 45 of gestation.
      
Isolation and cultivation of stem and progenitor cells of human embryos and fetuses at the age of 7-12 weeks of gestation have been described.
      
The influence of handling during the late gestation period on the pituitary-adrenal axis was studied in 10-day old male and female blue foxes.
      
Although it was shown that nitric oxide plays an essential role during gestation, its role in the preimplantation period is not yet fully clear.
      
Specific binding of bovine prolactin and somatotropin by granulosa cells from the antral follicles of various diameters was studied in cows at different reproductive states, prepubertal, pubertal, and early gestation.
      
Congenital malformations (CMFs) have been studied in newborns, infants that died at ages under one year, and fetuses after 22 weeks of gestation.
      
Here, we studied effect of transforming growth factor alpha (TGFα) treatment in vitro (10 ng/ml at the morula stage) on the expression of Igf2/H19 locus in mice PE (9.5 days of gestation, 25 somites) and their placentas (PP).
      
The method is based on the relationship between the number of days before calving and the average weight of fetuses, which obviates the necessity of determining fetal age and exact gestation period in this species.
      
The average length of gestation, the dates of the rut in the years studied, and the age of females that have mated immediately upon the onset of the rut and before its cessation have been determined.
      
Desmin was revealed in sinusoidal liver cells between 3.5 and 12 weeks of gestation; in mesenchymal cells of ventral mesentery and hepatoblasts it was detected at the 4-7th weeks of gestation.
      
Mesenchymal cells of the ventral mesentery expressed cytokeratins 18 and 19 more than hepatoblasts at the 4-7th weeks of gestation.
      
CD34 positive cells were detected in liver sinusoids between the 4th and 9th weeks of gestation but probably they are not progenitors of hepatocytes during embryonic development.
      
 

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