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The Mammalian Preimplantation Embryo - Regulation of Growth and Differentiation in Vitro (Paperback, Softcover reprint of the original 1st ed. 1987)
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The Mammalian Preimplantation Embryo - Regulation of Growth and Differentiation in Vitro (Paperback, Softcover reprint of the original 1st ed. 1987)
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With a few notable exceptions, mammalian preimplantation embryos
grown in vitro are likely to exhibit sub-optimal or retarded
development. This may be manifested in different ways, depending on
the species and on the stage(s) of embryonic development that are
being examined. For example, bovine embryos often experience
difficulty in cleaving under in vitro conditions, and usually cease
development at about the 8-cell stage (Wright and Bondioli, 1981).
The block to development is stage-dependent; embryos cultured for
24 hr from the I-cell stage are much more capable of developing
into viable blastocysts after transfer to oviducts than embryos
cultured for 24 hr from the 4-cell stage prior to transfer
(Eyestone et oZ. , 1985). Similar problems with in vitro embryo
development are encountered in other species. Pig embryos can be
grown up to the 4-cell stage in vitro but usually no further (Davis
and Day, 1978). In the golden hamster, in the rat and in many
outbred strains of mice, development of zygotes in vitro is blocked
at the 2-cell stage (Yanagimachi and Chang, 1964; Whittingham,
1975). Even with some inbred mouse strains, embryo development is
reduced if very early cleavage stages are used as the starting
point for in vitro culture (Spielmann et oZ. , 1980). A common
finding is that embryos grown in vitro have reduced cell counts
(Harlow and Quinn, 1982; Kane, 1985) and their viability is reduced
(Bowman and McLaren, 1970; Papaioannou and Ebert, 1986) compared to
equivalent developmental stages recovered from mated animals.
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