From: A comprehensive fate map by intracellular injection of identified blastomeres in the marine polychaete Capitella teleta
Micromeres
Macromeres
a
b
c
d
A
B
C
D
First quartet
12
15
13
18
-
Second quartet
17
27
22
2
4
Third quartet
14
10
9
20
Fourth quartet
23
11