Vitrification of embryos at the four-cell stage resulted ... Embryos were pipetted into a 1 μl drop of the second cryopreservation solution and then loaded into a pulled straw using capillary ...

A PubMed search performed on 14 April 2012 with a starting publication date of 1 January 2006 and closing date of 31 December 2011 for 'vitrification ... human oocytes and embryos were ...