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* The ruminant conceptus undergoes rapid elongation between day 14 and 16.
 
* The ruminant conceptus undergoes rapid elongation between day 14 and 16.
* During this period, IFN-τ is secreted at high levels before decreaseing.
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* During this period, IFN-τ is secreted at high levels before decreasing.
 
* Small embryos produce much less IFN-τ than larger embryos.
 
* Small embryos produce much less IFN-τ than larger embryos.
 
* There is a hige proportion of embryo loss in the first 3 weeks of gestation, as small embryos fail to secrete enough IFN-τ in this critical period.  Thus they do not block luteolysis.
 
* There is a hige proportion of embryo loss in the first 3 weeks of gestation, as small embryos fail to secrete enough IFN-τ in this critical period.  Thus they do not block luteolysis.
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