Immunofluorescence staining of oocytes After a brief rinse with PBS/0.05% polyvinylpyrrolidone (to prevent adhesion), the oocytes were permeabilized with 0.5% Triton X-100/PHEM for 5 min, fixed in 3.7% PFA/PHEM (18.14 g PIPES, 6.5 g HEPES, 3.8 g EGTA, 0.99 g MgSO4, pH 7.0 w/KOH) for 20 min, and washed three times (10 min each) with PBS/polyvinylpyrrolidone
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If it does not, the most defensible general approach is cold-chain handling: freezer storage for long-term dry powder, refrigerator storage for short-term reconstituted solution, and no casual room-temperature storage after mixing
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