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List of main abbreviations used in the text
| COR | Cold-responsive or cold-regulated |
| NR | Nitrate reductase |
| AO | Aldehyde oxidase |
| XDH | Xanthine dehydrogenase |
| SO | Sulfite oxidase |
| TF | Transcription factor |
| CBF | C-repeat binding factor |
| bZIP | Basic leucine zipper |
