Mouse Anatomical Dictionary - Stage 3 (Morula)

TS3:    
|   TS3: 4-8 cell stage [8] 
|   |   TS3: 4-cell stage  (4-cell embryo)
|   |   TS3: 8-cell stage  (8-cell embryo)
|   TS3: compacted morula [9] 
|   TS3: second polar body [10] 
|   TS3: zona pellucida [11]