**Appendix A**

Since many genes and proteins from different organisms are discussed in this review, I adopted universal nomenclature rules according to a highly popular textbook [183]. Gene symbols are written in italics, with the first letter in uppercase indicating a wild-type allele and in lowercase indicating a mutant allele. Proteins are written in non-italics. If the text relates to genes or proteins from a certain species, a two-letter prefix (Hs for *Homo sapiens,* At for *Arabidopsis thaliana* etc.) is used.
