RESULTS
Skin tissues from all 27 species contained both carotenoid and pteridine
pigments (Figure 1). Among our
samples, lutein/zeaxanthin (yellow) and β-carotene (orange) were the
carotenoids with the highest concentrations. Isoxanthopterin and
pterin-6-carboxilic acid were the pteridines with the highest
concentrations but we also found substantial concentrations of yellow
xanthopterin and red drosopterin (Figure S1).