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The zona pellucida of mouse oocytes becomes resistant to chymotrypsin digestion, or "hardened", when spontaneous maturation occurs in serum-free medium (De Felici and Siracusa, Gam Res 1982; 6:107).(More)
OBJECTIVE To determine the utility of an audio-guided Doppler ultrasound device in improving success and decreasing complications in cannulation of the internal jugular vein in high-risk patients. (More)