Background: Success in assisted reproductive techniques is raising hope for many infertile couples, but as in these techniques many embryos are made, there is no choice other than cryopreservation of the not-transferred embryos. Along with development of these techniques, the number of In-vitro made embryos is rising and the number of transferred embryos is decreasing to prevent multiple gestat...

The activation of the mouse embryo genome has been studied during early cleavage, in vivo. Individual embryos, prepared as whole mounts, were assayed for endogenous RNA polymerase activity. RNA synthesis was detected by autoradiography as the incorporation of [3H]UMP into an acid-insoluble product. No RNA polymerase activity could be detected in the pronuclei of one-cell embryos. Radioactive in...

Adult bone marrow (BM) contains hematopoietic stem cells (HSCs) as well as a nonhematopoietic, stromal cell population. Within this stromal population are mesenchymal stem cells (MSCs), which not only support hematopoiesis but also differentiate into multiple lineages, including fat, bone, and cartilage. Because of this multipotentiality, the MSC is an attractive candidate for clinical applicat...

BACKGROUND/AIM Obtaining human embryonic stem cell lines has so far involved destroying the embryos. This has given rise to ethical concerns and is not permitted in most countries. This investigation tested whether removing multiple cells from blastocysts might allow continued embryonic development. MATERIALS AND METHODS A total of 40 blastocysts from a black mouse strain were biopsied. The m...

Production of high quality embryos in vitro needs an efficient in vitro fertilization (IVF). Seminal origin is one of the important factors that affects the success of in vitro embryo production. So our goal was to determine the effect of using fresh and frozen semen in fertilization on developmental competence and cryo-survival of buffalo embryos. Buffalo oocytes wer...

objective: to study the structure and distribution of microtubules in embryos derived from young, old and reconstructed oocytes. materials and methods: embryos obtained from old (50 embryos), young (50 embryos) and reconstructed oocytes (10 embryos) were studied by immunocytochemistry. the microtubule structures of the embryos were studied by using fluroscent microscopy with fitc-pi filter and ...

The efficiency of cloning by somatic cell nuclear transfer (SCNT) has remained low. In most cloned embryos, epigenetic reprogramming is incomplete, and usually the genome is hypermethylated. The DNA methylation inhibitor 5-aza-2'-deoxycytidine (5-aza-dC) could improve the developmental competence of cow, pig, cat and human SCNT embryos in previous studies. However, the parameters of 5-aza-dC tr...

Previous studies have shown that morphine administration could inhibit neural tube development in rat embryos and produce behavioral defects in human and animals. In the present study, the effects of maternal morphine consumption on embryonic neural plate development in Wistar rats were investigated. Methods: Twenty-four female Wistar rats (250-300 g) were crossed with males. After pregnancy...

In contrast to the deregulated hepatocellular division that is a feature of many hepatic diseases and malignancies, physiologic liver growth during embryonic development and after partial hepatectomy (PH) in adults is characterized by tightly controlled cell proliferation. We used forward genetic screening in zebrafish to test the hypothesis that a similar genetic program governs physiologic li...