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. 2023 Mar 16;11(3):678. doi: 10.3390/vaccines11030678
1st step −50 °C 150 mTorr 2 h
2nd step −40 °C 100 mTorr 2 h
3rd step −30 °C 100 mTorr 2 h
4th step −20 °C 50 mTorr 2 h
5th step −10 °C 50 mTorr 2 h
6th step −5 °C 50 mTorr 2 h
7th step 0 °C 50 mTorr 2 h
8th step +10 °C 50 mTorr 2 h
9th step +20 °C 50 mTorr 4 h