Cover illustration: The cover illustration shows the effect of down-regulating the carotenoid biosynthesis pathway gene Phytoene
Desaturase (PDS) by Virus-Induced Gene Silencing (VIGS) in California poppy. Carotenoids are the main pigments responsible for California poppies' orange petal colouration. Successful down-regulation of the PDS gene is easily visible as white sectors in California poppy petals. See Wege et al., pp.
641-649.
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