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Illustration showing the open vitrification and warming system and the risk it offers for the germplasm samples. (a) Cryopreservation straw with the vitrified embryo. (b) Immersion of straw in contaminated LN2. (c) Straw stored in LN2 container. (d) Warming of the straw with the contaminated sample. (e) Contaminated germplasm.
