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I am certainly not an expert, but as far as I am aware of this issue, this is a way of freezing and transporting biomaterial, in particular, female male germ cells, to IVF clinics, surrogacy agencies and specific clients. Here is the Ark Cryo company https://arkcryo.com/ just doing similar things, if interested, you can refer to them. Everything there is safe and guaranteed the safety and survival of cells and embryos upon delivery. A special dry shipper filled with liquid nitrogen is used.