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The arrest of cell migration in the chicken blastoderm: experimental evidence for the involvement of a band of extracellular fibrils associated with the basal lamina

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Academic year: 2020

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Figure

Fig. 1. Schematicrepresentationof a stage-5blastoderm,to show thedispositionof the differentgermlayersin a sagittalsection(S8! andin transversesections(a-dL The Arabic numerals indicatethe differentregionsof rhe deeplayer.1,volk endoderm; 2, endophyl!; 3,
Fig. 2. Mediosagittalsectionof a stage-5chickenblastodermat the level of the endophylliccrescentand at the edgeof the area opaca(AOJIarea pellucida (AP), The insetsindicatethe areas chosenfor ultrathinsectiomng_DL
Fig. 8. High magnificationof a basallamina-associatedfibril (asterisk)of 0.3 pm x 0.7 pm in size.The basal/amlna,clearlyresolvedinto a laminalucida(LL) and a laminadensa(LD),is closelyapposedto the plasmamembrane.Magnification:x94000.
Fig. 9. SEM photomicrographat low magnificationof the ventralside of a stage-6blastodermafter removalof its deeplayer.The asterisksindicate the location of a horseshoe-shapedfibrillarbandInside this band, the basal lamina is smooth,and only rnterstitlal bo
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