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Table 2 Parameter set - parameters of the simulation.

From: Modeling lymphocyte homing and encounters in lymph nodes

PARAMETER

SYMBOL

MEANING

RANGE

VALUE (UNITS)

REF.

KNOWN VALUES

DupStepB

d B

B's duplication steps

N

4

[34]

DupStepTH

d TH

TH's duplication steps

N

4

[34]

VelocityB

v B

B cells' velocity

R

6 μ m/min

[27, 28]

VelocityTH

v TH

TH's velocity

R

11 μ m/min

[27, 28]

VelocityDC

v DC

DCs' velocity

R

3 μ m/min

[25]

DiffCoeff

D

chemokines' diffusion coeff.

R

3·103 μ m2/min

[27, 28]

HalfLife

λ

chemokines' half life

R

3 hrs

[25, 26]

NInitial [B]

B(0)

B's initials per μ l

N

105 (cells/μ l)

[5, 31]

NInitial [TH]

TH(0)

TH's initials per μ l

N

2·105 (cells/μ l)

[5, 31]

NInitial [DC]

DC(0)

DC's initials per μ l

N

103 (cells/μ l)

[5, 31]

NCELLS_B_ENTRY

f B

incoming flux of TH cells

N

31 cells/min

[5]

NCELLS_TH_ENTRY

f TH

incoming flux of TH cells

N

190 cells/min

[5]

ARBITRARY PARAMETERS

NBITSTR

l

bit-string length

N

22 (*)

-

pDCAg

p DC

DC affinity to Ag (prob)

[0, 1]

0.04

-

nHEV

n HEV

numbers of HEV per μ l

N

4 (μ l-1)

[30]

pExit

p Exit

exit prob for cells

[0, 1]

0.44

-

ChemQty

q

released chemokines qty

R

108 mol (min src)-1

[35]

INITIAL CONDITIONS

microL

mL

volume

N

10 (μ l)

-

deltaT

Δt

time resolution

R

30 (min)

-

nSteps

T

time steps of the simulation

N

500 (steps)

-

AgInjFreq

f Ag

injection freq. of soluble Ags

N

4 (day-1)

-

AgInjQty

n Ag

soluble Ags per injection

N

100

-

  1. Values that are taken from literature are provided with references. N and R indicate integer and real numbers respectively. (*) This choice of the bit string length represents a tradeoff between the computational cost of the simulation and the variability required for a realistic description of receptors repertoire.