Stage 6 (2 hrs 55 min)
16 cell stage
Drown by T. Iwamatsu
(Abbr. y : yolk sphere)
Stage 6 (2 hrs 55 min) 16 cell stage:
The fourth cleavage plane, which is parallel to the second, divides the 2 rows of 4 blastomeres into 4 rows of 4 blastomeres.