Additional file 4.

Relative expression of structural genes and transcription factors. Expression was determined in comparison to the housekeeping gene glyceraldehyde 3-phosphate dehydrogenase (GAPDH) in the white cv. White Alva (1), yellow cvs. Rubens (2) Alva’s Supreme (3), red cvs. Feuerschein (4), Cheerio (5), and black cvs. Arabian Night (6), Auroras Kiss (7), Black Jack (8), Charles de Gaulle (9), Chat Noir (10), Karma Choc (11), Magic Night (12), Meteor (13), Mythos (14), Negerkopf (15), Tisa (16), Black Barbara (17).

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Thill et al. BMC Plant Biology 2012 12:225   doi:10.1186/1471-2229-12-225