i
n
i
t
i
a
l
n
u
m
b
e
r
o
f
c
e
l
l
s
N
0
1
0
0
t
i
m
e
(
a
r
b
i
t
r
a
r
y
u
n
i
t
s
)
t
2
0
.
p
r
o
b
a
b
i
l
i
t
y
r
a
t
e
o
f
c
e
l
l
d
i
v
i
s
i
o
n
a
s
y
m
p
t
o
t
e
P
d
a
s
y
m
p
0
.
4
s
t
e
e
p
n
e
s
s
k
d
0
.
3
c
h
a
r
a
c
t
e
r
i
s
t
i
c
t
i
m
e
t
c
d
1
5
.
p
r
o
b
a
b
i
l
i
t
y
r
a
t
e
o
f
c
e
l
l
m
o
r
t
a
l
i
t
y
a
s
y
m
p
t
o
t
e
P
m
a
s
y
m
p
0
.
4
5
s
t
e
e
p
n
e
s
s
k
m
0
.
4
c
h
a
r
a
c
t
e
r
i
s
t
i
c
t
i
m
e
t
c
m
2
0
.
t
i
m
e
a
x
i
s
m
a
x
i
m
u
m
5
0
.
P
d
(
t
)
=
0
.
3
3
P
m
(
t
)
=
0
.
2
3
N
c
e
l
l
s
(
t
)
=
4
3
7