Table 1.

Definitions of cell kinetic parameters used in this paper

Stem cells
s ( a )	Density function of cycling stem cells
s ( a )δ a	Age distribution of cycling stem cells
s (0)	Rate of entry into stem cell‐cycle
ρs(a)δa	Probability distribution of stem cell‐cycle times
p s ( a )δ a	Apoptosis‐corrected probability distribution of stem cell‐cycle times
m ( a )δ a	Distribution of stem cell‐cycle times
M ( a )δ a	Apoptosis‐corrected distribution of stem cell‐cycle times
T̄s	Mean stem cell‐cycle time
T̂s	Effective stem cell‐cycle time
	Variance of stem cell‐cycle time
φs	Coefficient of variation of stem cell‐cycle time, σs/T̄s
N s	Density of stem cells
f	Fraction of cycling stem cells
r s	Rate of stem cell division
βs	Stem cell apoptotic rate
α	Stem cell apoptosis correction term
Transit‐amplifying cells
t i ( a )	Density function of ith generation transit‐amplifying cells
t i ( a )δ a	Age distribution of ith generation transit‐amplifying cells
t i (0)	Rate of entry into ith generation cell‐cycle
ρt(a)δa	Probability distribution of transit‐amplifying cell‐cycle times
p t ( a )δ a	Apoptosis‐corrected probability distribution of transit‐amplifying cell‐cycle times
T̄t	Mean transit‐amplifying cell‐cycle time
T̂s	Effective transit‐amplifying cell‐cycle time
	Variance of transit‐amplifying cell‐cycle time
φt	Coefficient of variation of transit‐amplifying cell‐cycle time, σt/T̄t
φt	Density of ith generation transit‐amplifying cells
N t	Density of all transit‐amplifying cells
g	Maximum number of transit‐amplifying cell generations
βt	Transit‐amplifying cell apoptotic rate
Q i	Probability of an ith generation transit‐amplifying cell giving two post‐mitotic cells
Pi
l A–D	Frequency of transit lineages
General
a	Chronological age of cells
δa	Small amount of age
r	Birth rate of post‐mitotic cells per unit area of skin surface
N	Total cell density in germinative compartment
r ′	Cell birth rate of germinative compartment
GF	Growth fraction of germinative compartment
ζ, ξ	Dummy variables