Embryo Collecting Buffer II
In advance, prepare a 7× stock solution of cOmplete, Mini, EDTA-free Protease Inhibitor Cocktail (Sigma-Aldrich 11836170001) and a 100 mm stock solution of spermine (e.g., Sigma-Aldrich S1141-1G) in DNase-, RNase-free H2O. Store both at −20°C until use. Prepare the recipe as follows:
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Prepare fresh in a 1.5-mL microcentrifuge tube (RNase/DNase-free) and store on ice. This amount of buffer is appropriate for collecting 20 embryos.










