FGF2 and major depressive disorder: They cited, as other stress marker candidates, testosterone, dehydroepiandrosterone (DHEA) and its sulfonated analogue DHEA-S, α-amylase, secretory immunoglobulin A, and chromogranin A. Quite recently, Chojnowska et al. [28] suggested, in their review article, that promising salivary biomarkers of stress, anxiety, or depression are cortisol, immunoglobulin A (IgA), lysozyme, melatonin, α-amylase, chromogranin A, and fibroblast growth factor 2 (FGF-2).