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Retinal and lenticular anlagen were specifically examined for architectural and cellular changes. Nearly all severely abnormal eyes showed no evidence of retina development: Of 41 such eyes, only two retinal rudiments were observed. Those eyes with mild microphthalmia always demonstrated retinae although architectural changes were present. In every abnormal eye, some degree of lenticular morphogenesis was always present. Lenses were small, displaced in the eye field, and arrested at the lens vesicle stage. Lens cells were markedly undifferentiated and thus lacked most of the cytological features normally present at this developmental stage. Neither retinal nor lenticular rudiments were necrotic despite major architectural and cytological disturbances. The data offer three conclusions: First, the absence of necrosis suggests that trypan blue causes developmental arrest in this eye model; second, absence of retinae is most likely due to primary failure of optic vesicle development; third, lack of lens differentiation is attributed to absence of the retina, the primary lens inducer.<\/jats:p>","DOI":"10.1002\/tera.1420280116","type":"journal-article","created":{"date-parts":[[2005,6,12]],"date-time":"2005-06-12T00:14:07Z","timestamp":1118535247000},"page":"131-144","source":"Crossref","is-referenced-by-count":7,"title":["Ultrastructure of trypan blue induced ocular defects: I. 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