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Embryonic Cell/Time Correlation Table 1

Standard Temperature: 20 degree C

Embryonic Life_stage, Cell number, Time and Morphology correlation table    
(At 20 degree)    
Cell Number Time (mins) Morphology
1 -50 zygote
2 0 first cleavage
4 20  
6 40  
8 50  
12 55  
14 65  
15 70  
23 75  
24 80  
26 90  
28 100 beginning gastrulation. gastrulation begins Ea, Ep enters
44 105  
46 110  
48 115  
51 120 P4&Ms cells enter (ends 200 min)
83 135  
87 140  
88 145  
92 150  
96 155  
101 165  
103 170  
168 175  
  180 C & D cells enter(ends 230 min)
175 185  
184 195  
190 200 ends P4&M
192 205  
193 210 late gastrulation. AB derived pharynx enter(ends 250 min)
197 215  
217 220  
254 225  
268 230 ventral cleft closes; ends C &D
307 235  
328 240  
351 245  
358 250 ends AB pharynx; 
359 255  
357 260  
366 265  
368 270  
374 275  
380 280  
397 285  
421 290 ends ventral cleft closes 
458 295  
471 300  
490 305  
508 310  
519 315  
529 320  
547 325  
556 330  
564 335  
559 340  
558 345  
560 350  
560 355  
564 360  
567 365  
567 370  
561 375  
560 380  
563 385  
564 ~390 comma
561 395  
568 400  
567 405  
572 410 1.5-fold
578 415  
574 425  
575 430 first movement
574 435  
571 440  
565 445  
564 450 embryo starts rotating
562 455  
  ~460 2-fold
561 470  
557 475  
559 485  
  ~490 visual sexual dimorphism
  ~520 3-fold
  ~620 last cell death
556 635  
  ~660 cuticle synthesis begins
  ~730 pharyngeal pumping begins
557 735  
558 740  
558 ~800 hatching

* Cell number jumps when time reach the next point. For example: at 100 min, there are 28 cells, the cell number remains the same until 105 min.


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