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Fig. 2. Critical steps in the tanning pathway. (A) Metabolites of
dopamine are required for tanning. Tyrosine hydroxylase (encoded by
ple) converts tyrosine into dopa and dopa decarboxylase (encoded by
Ddc) catalyses the conversion of dopa to dopamine. (B)
Alternative splicing of ple and Ddc. Both ple and
Ddc are alternatively spliced to produce neural-specific (shown above
exon boxes) and epidermal-specific (shown below exon boxes) transcripts. The
coding sequence is shaded in grey.