Annotation of the first 9035 retinal ESTs. (A) Distribution of functional classes. The top pie chart shows the distribution with unknown ESTs included. The unknown ESTs are removed from the bottom pie chart. (B) Distribution of EST prevalence. The histogram shows 23 functional subclasses as a function of EST number per gene. The distribution ranges from 1.3 ESTs/gene (receptors) to 4.9 ribosomal proteins/translation factors.