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- W2007230519 abstract "Constituents of the culture milieu known to influence development of hamster 2-cell and 8-cell embryos were examined for effects on the 4-cell stage. Embryos were collected at the mid 4-cell stage (approx. 45-46 h after egg activation) from superovulated females and cultured for 24 h in a chemically defined medium (TLP-PVA). As with the 2-cell stage, inorganic phosphate (Pi) strongly inhibited development of 4-cell embryos, although some (14%) were able to reach the 8-cell stage or further in the presence of Pi. However, unlike 2-cell embryos, no significant inhibitory effect of glucose on development of 4-cell embryos was found. In the absence of glucose and Pi, development of 4-cell embryos was sensitive to amino acids in the medium: the mean cell number was increased using 21 amino acids compared with 4 amino acids, similarly to the 2-cell stage; however, late blastocyst development (blastocele formation) from 4-cell embryos was reduced using 21 compared with 4 amino acids, as with 8-cell embryos. Similarly to the 2-cell and 8-cell stages, raising the CO2 concentration from 5% to 10% in the gas atmosphere for culture increased the percentage of total blastocysts developing from the 4-cell stage, but did not affect the proportions of late-stage blastocysts. These data show that 4-cell-stage hamster embryos are somewhat similar to 2-cell embryos with respect to the regulation of development by constituents of the culture milieu, but, to some extent, the 4-cell embryo is a transitional stage of development." @default.
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- W2007230519 date "1990-01-01" @default.
- W2007230519 modified "2023-09-27" @default.
- W2007230519 title "Development of four-cell hamster embryos to the blastocyst stage in vitro and its regulation by components of the culture milieu" @default.
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- W2007230519 doi "https://doi.org/10.1071/rd9900001" @default.
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