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The first objective was to compare sperm quality following conventional manual sperm freezing (cryovials held 1, 2, 3, and 4 cm, respectively, above liquid nitrogen (LN 2 ) for 10 min, resulting in cooling velocities of approximately −14.9, −10.1, −6.6, and −5.1 °C/min, respectively), and cooling velocities of −5, −20, −40, and −100 °C/min in a programmed automated freezer, for sperm recovered...
Efficient collection, freezing, reliable archiving of sperm, and re-derivation of mutant mice are essential components for large-scale mutagenesis programs in the mouse. Induced mutations (i.e. transgenes, targeted mutations, chemically induced mutations) in mice may cause inherited or temporary sterility, increase abnormal sperm values, or decrease fertility. One purpose of this study was to compare...
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