Table 1.

Serotonergic proteins expressed in human immune cells.

	5HT1	5HT2	5HT3	5HT4	5HT5	5HT6	5HT7	SERT	Anabolism	Catabolism
Cellular Types	1A: B Lymphocytes∗‡ [35, 36] 1A: T Cell§∗† [37] 1A: Mast cells§∗‡ [38] 1A: Eosinophils§‡ [39] 1B: Eosinophils§‡ [39] 1B: Dendritic cells§‡ [2] 1B: Mast cells§∗‡ [38] 1B: T cell∗† [40, 41] 1D: Mast cells∗‡ [38] 1E: Monocytes§‡ [42] 1E: Eosinophils§‡ [39] 1E: Dendritic cells§‡ [2, 43] 1E: Mast cells§‡ [38]	2A: Lymphocytes§† [44] 2A: Monocytes§‡ [42] 2A: PBMC§† [10] 2A: Dendritic cells§‡ [2] 2A: Mast cells§∗‡ [38] 2A: Eosinophils§∗‡† [39, 45] 2A: T cell∗‡† [40] 2B: Mast cells§∗‡ [38] 2B: Dendritic cells§‡ [2, 43] 2C: Mast cells§‡ [38]	3: Mast cells§‡ [38] 3: Dendritics cells§‡ [2, 43] 3A: Lymphocytes§‡† [46] 3A: Monocytes§‡† [42, 47] 3A: B cells§‡† [48] 3A/3E: Lymphatic Ganglion§‡ [49]	Dendritic cells§‡ [2, 43] Monocytes§‡ [42, 50] Mast cells§‡ [38]		Eosinophils§‡ [39] Mast cells∗‡ [38]	Dendritic cells§‡† [2, 43, 50] Monocytes§‡ [42, 50] Mast cells§∗‡ [38] T Cell†‡∗ [40]	Lymphocytes§∗‡† [51–55] Leukocytes§‡ [56] Monocytes§† [57] Dendritic Cell§∗‡† [58, 59]	TPH1: T Cells‡∗ [40, 58] TPH1: Mast Cell∗‡ [38]	IDO: Lymphocytes§‡† [60] IDO: Monocytes§‡† [61] IDO: Dendritic Cells§‡†[60] MAO-A: Monocytes§‡ [62]

^§Human, ^∗Murine, ^‡Expression, ^†Protein.