Abstract

RNase protection assays were used to follow rhodopsin and red cone opsin mRNA levels during bovine fetal development as a function of retinal position. Following induction, an equivalent radial gradient of rod and cone opsin mRNA is present in the fetal retina. This gradient is maintained in the adult retina even though no corresponding gradient in rod or cone cell density is present. Since the mRNA expression gradient does not progress radially, position dependent levels of photoreceptor-specific transcription is suggested.

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