Figure 3. General relationships between 
, 
and 
.
(A) In general, 
is positively correlated with 
. For teleosts where 
is smaller, 
is lower; For humans where 
is bigger, 
is higher. (B) The epithelium renewal cycle is also correlated to the value of 
. Bigger value of 
means longer renewal cycle. Cycles are normalized to be dimensionless. 
: dividing frequency
stem population/transit amplifying population; 
: intestinal epithelium renewal cycle; 
: ratio of differentiated epithelium population/transit amplifying population.