![](http://www.alamy.com/thumbs/6/214A3056-B615-4971-842F-7F5CC8478FAA/CRP913.jpg)
Fertilised embryos are stored in liquid nitrogen filled tanks to keep them 'as new' if patients require them at a later date.
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Photo credit: © Medicshots / Alamy / Afripics
License: Licensed
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Keywords: clinic, doctor, embryo, fertilisation, fertility, liquid, ln, ln2, nitrogen, sample, storage, vitro