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Fig. 4. Quantification of opsin gene transcript levels in the larval and adult
retina. Each bar shows the mean (±s.e.m.) relative expression of each
opsin in either the larva or adult. The values were obtained from separate RNA
preparations from four adult retinae and three pools of 20 larval heads. For
each opsin, the difference in relative expression between larva and adult was
statistically significant (Student's t-test) at the 1% probability
level.