. Author manuscript; available in PMC: 2011 Jun 21.

Published in final edited form as: J Theor Biol. 2010 Apr 1;264(4):1225–1239. doi: 10.1016/j.jtbi.2010.03.027

Table 2. A.2.

Population levels in homeostasis

Symbol	Description	Initial concentration
Inductive site
T_n	Naive CD4+ T-cells	1.2 · 10⁸(Haase, 1999)
T_C	CD4+ Central Memory T-cells	1.2 · 10⁸
$T_{h}^{I}$	Active CD4+ T helper cells	0
$T_{i}^{I}$	Induced T regulatory cells	177
$T_{r}^{I *}$	Active natural T regulatory cells	63
$C_{a}^{I}$	Activating cytokines	0
$C_{d}^{I}$	Deactivating cytokines	1.6218 · 10⁷
$D_{e}^{I}$	Effector dendritic cells	0
$D_{t}^{I}$	Tolerogenic dendritic cells	4.39 · 10⁶(Catron et al., 2004)
$D_{a}^{I}$	Anergic dendritic cells	0
Effector site
T_E	CD4+ Effector T-cells	9.3 · 10⁷
$T_{h}^{E}$	Active CD4+ T helper cells	0
$T_{i}^{E}$	Induced T regulatory cells	1117.25
$T_{r}^{E *}$	Active natural T regulatory cells	3
$T_{r}^{E}$	Resting natural T regulatory cells	2.99 · 10⁷
$C_{a}^{E}$	Activating cytokines	0
$C_{d}^{E}$	Deactivating cytokines	7.02 · 10⁶
$M_{0}^{E}$	Undifferentiated macrophages	1.2 · 10⁸
$M_{1}^{E}$	Activating macrophages	0
$M_{2}^{E}$	Deactivating macrophages	0
$D_{i}^{E}$	Immature dendritic cells	1.2 · 10⁸(Hogue et al., 2008)
$D_{e}^{E}$	Effector dendritic cells	0
$D_{t}^{E}$	Tolerogenic dendritic cells	2.105 · 10⁶
E	Epithelial cells	10⁴(Kelly et al., 2004)
E_p	Pro-inflammatory epithelial cell	0
$B_{c}^{E}$	Commensal bacteria	0
$B_{f}^{E}$	Foreign bacteria (Non-commensal)	0
Lumen
$B_{c}^{L}$	Commensal bacteria	5.26 · 10¹¹(Artis, 2008)
$B_{f}^{L}$	Foreign bacteria (Non-commensal)	5.26 · 10¹¹(Artis, 2008)
$D_{i}^{L}$	Immature dendritic cells that extend to the lumen	1 · 10⁶